Answer:
1.
![x=2](https://img.qammunity.org/2022/formulas/mathematics/high-school/44reazwucximx4d1uqoqmyb10x77od7ulw.png)
2. Simplify by combining like terms
3.
![x=1](https://img.qammunity.org/2022/formulas/mathematics/high-school/x1mtktx3ckqtr9c9bhuvh92xozouexxxze.png)
4.
![k=0.5](https://img.qammunity.org/2022/formulas/mathematics/college/sk2k9ipb3jnyznukg2lfb515ypasc8y3vh.png)
5.
![y=3](https://img.qammunity.org/2022/formulas/mathematics/high-school/y9iff074w2mzowsy1i3jmibzn7aqz18mb0.png)
Explanation:
1.
![2.5(6x-4)=10+4(1.5+0.5x)](https://img.qammunity.org/2022/formulas/mathematics/high-school/moduomve9ph2y80a2fdcu10cmdovjzzg1k.png)
Distribute within the parenthesis
![15x-10=10+6+2x](https://img.qammunity.org/2022/formulas/mathematics/high-school/4l33we5k6foffthkuqhklfi1xq30urjepr.png)
Combine like terms
![15x-10=16+2x](https://img.qammunity.org/2022/formulas/mathematics/high-school/5flw0k2efjbotxp5d4afaiaa1uniyupd6n.png)
Isolate the variable expression by using the addition/subtraction properties of equality
![13x=26](https://img.qammunity.org/2022/formulas/mathematics/high-school/co3nbd2iag25ewqzhwbji83s0py13oxzkn.png)
Isolate the variable by using the division/multiplication properties of equality
![x=2](https://img.qammunity.org/2022/formulas/mathematics/high-school/44reazwucximx4d1uqoqmyb10x77od7ulw.png)
2. Like terms are always combined as soon as possible but never before the distributive property is applied.
3. You can find the solution by comparing the tables.
4.
![6k+10.5=3k+12](https://img.qammunity.org/2022/formulas/mathematics/high-school/cjvkciavptg822kmcqoqvnk4n9ir13e26t.png)
Apply the addition/subtraction properties of equality
![3k=1.5](https://img.qammunity.org/2022/formulas/mathematics/high-school/f5orpwndkarbgtau9f3dziyq9n6oryhekk.png)
Apply the division/multiplication properties of inequality
![k=0.5](https://img.qammunity.org/2022/formulas/mathematics/college/sk2k9ipb3jnyznukg2lfb515ypasc8y3vh.png)
5.
![y+3=-y+9](https://img.qammunity.org/2022/formulas/mathematics/high-school/mhw5l66scwdkvst6zmd8phlq1rbprs1yua.png)
Addition/subtraction properties
![2y=6](https://img.qammunity.org/2022/formulas/mathematics/high-school/1gagn6dc2csuktdd22onuzl3ab40m7m6a1.png)
Division/Multiplication properties
![y=3](https://img.qammunity.org/2022/formulas/mathematics/high-school/y9iff074w2mzowsy1i3jmibzn7aqz18mb0.png)