4a-(-7a)=15+6a-40

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Solution for 4a-(-7a)=15+6a-40 equation: 



4a-(-7a)=15+6a-40

We move all terms to the left:

4a-(-7a)-(15+6a-40)=0

We add all the numbers together, and all the variables

4a-(-7a)-(6a-25)=0

We get rid of parentheses

4a+7a-6a+25=0

We add all the numbers together, and all the variables

5a+25=0

We move all terms containing a to the left, all other terms to the right

5a=-25

a=-25/5

a=-5

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