Answer:
Explanation:
8x-3=21
If you look through the steps, you see you are adding a value and subtracting a value which are the opposites, and the same for multiplying and dividing. It leads you on a whole spree when you can see it all cancels out, and you are left with your original. 8x-3=21
2(x+4)=12
Let's apply the distributive property.
2(x)+2(4)=12
2x+8=12
Now combine like terms for the rest to see which give you this answer.