129=-3(7a+8)

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Solution for 129=-3(7a+8) equation: 



129=-3(7a+8)

We move all terms to the left:

129-(-3(7a+8))=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+129=0

We add all the numbers together, and all the variables

21a+153=0

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

21a=-153

a=-153/21

a=-7+2/7

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