-171=-3(8+7a)

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Solution for -171=-3(8+7a) equation: 



-171=-3(8+7a)

We move all terms to the left:

-171-(-3(8+7a))=0

We add all the numbers together, and all the variables

-(-3(7a+8))-171=0



We calculate terms in parentheses: -(-3(7a+8)), so:

-3(7a+8)

We multiply parentheses

-21a-24

Back to the equation:

-(-21a-24)



We get rid of parentheses

21a+24-171=0

We add all the numbers together, and all the variables

21a-147=0

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

21a=147

a=147/21

a=7

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