-3(5+7a)=-57

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Solution for -3(5+7a)=-57 equation: 



-3(5+7a)=-57

We move all terms to the left:

-3(5+7a)-(-57)=0

We add all the numbers together, and all the variables

-3(7a+5)-(-57)=0

We add all the numbers together, and all the variables

-3(7a+5)+57=0

We multiply parentheses

-21a-15+57=0

We add all the numbers together, and all the variables

-21a+42=0

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

-21a=-42

a=-42/-21

a=+2

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