-(a+7)=-8

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Solution for -(a+7)=-8 equation: 



-(a+7)=-8

We move all terms to the left:

-(a+7)-(-8)=0

We add all the numbers together, and all the variables

-(a+7)+8=0

We get rid of parentheses

-a-7+8=0

We add all the numbers together, and all the variables

-1a+1=0

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

-a=-1

a=-1/-1

a=1

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