-3(-5a-8)=129

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Solution for -3(-5a-8)=129 equation: 



-3(-5a-8)=129

We move all terms to the left:

-3(-5a-8)-(129)=0

We multiply parentheses

15a+24-129=0

We add all the numbers together, and all the variables

15a-105=0

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

15a=105

a=105/15

a=7

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