The answer is: x = 400
Here's how I got my answer:
Step 1: Subtract .60 from both sides. Leave us with
![100=20+0.80x-0.60x](https://img.qammunity.org/2019/formulas/mathematics/middle-school/pvk63p6zlcim60pjyd9hoxkdbjgf2ozj6i.png)
Step 2: Simplify
to
. Which leaves us with
![100 = 20 + 0.2x](https://img.qammunity.org/2019/formulas/mathematics/middle-school/doj8qtk8i7dqoknvjdt6gpezsd2rsuzuq8.png)
Step 3: Subtract 20 from both sides. Which leaves us with
![100-20=0.2x](https://img.qammunity.org/2019/formulas/mathematics/middle-school/adebiots7iyigcbzut0fsp5bj3eknrumtx.png)
Step 4: Simplify
to 80. Which leaves us with
![80 = 0.2x](https://img.qammunity.org/2019/formulas/mathematics/middle-school/wf86285eue3agw1g7r44ai0xfci6wdarcg.png)
Step 5: Divide both sides by 0.2. Which leaves us with
![80/0.2 = x](https://img.qammunity.org/2019/formulas/mathematics/middle-school/pxrz7w67wt91fnajpg3zyhwgv92y4tpe36.png)
Step 6: Simplify
to 400. Which leaves us with our answer, x = 400