-8(3a+6)=72

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Solution for -8(3a+6)=72 equation: 



-8(3a+6)=72

We move all terms to the left:

-8(3a+6)-(72)=0

We multiply parentheses

-24a-48-72=0

We add all the numbers together, and all the variables

-24a-120=0

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

-24a=120

a=120/-24

a=-5

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