(10a-7+2a)+(6a+15-3a)=-7

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Solution for (10a-7+2a)+(6a+15-3a)=-7 equation: 



(10a-7+2a)+(6a+15-3a)=-7

We move all terms to the left:

(10a-7+2a)+(6a+15-3a)-(-7)=0

We add all the numbers together, and all the variables

(12a-7)+(3a+15)-(-7)=0

We add all the numbers together, and all the variables

(12a-7)+(3a+15)+7=0

We get rid of parentheses

12a+3a-7+15+7=0

We add all the numbers together, and all the variables

15a+15=0

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

15a=-15

a=-15/15

a=-1

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