13+2a=-(a-7)

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Solution for 13+2a=-(a-7) equation: 



13+2a=-(a-7)

We move all terms to the left:

13+2a-(-(a-7))=0



We calculate terms in parentheses: -(-(a-7)), so:

-(a-7)

We get rid of parentheses

-a+7

We add all the numbers together, and all the variables

-1a+7

Back to the equation:

-(-1a+7)



We get rid of parentheses

2a+1a-7+13=0

We add all the numbers together, and all the variables

3a+6=0

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

3a=-6

a=-6/3

a=-2

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