-3(5a-3)=129

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



-3(5a-3)=129

We move all terms to the left:

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

We multiply parentheses

-15a+9-129=0

We add all the numbers together, and all the variables

-15a-120=0

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

-15a=120

a=120/-15

a=-8

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