-13-7a=-3(a+7)

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Solution for -13-7a=-3(a+7) equation: 



-13-7a=-3(a+7)

We move all terms to the left:

-13-7a-(-3(a+7))=0



We calculate terms in parentheses: -(-3(a+7)), so:

-3(a+7)

We multiply parentheses

-3a-21

Back to the equation:

-(-3a-21)



We get rid of parentheses

-7a+3a+21-13=0

We add all the numbers together, and all the variables

-4a+8=0

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

-4a=-8

a=-8/-4

a=+2

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