3(-7-8a)=-39-6a

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Solution for 3(-7-8a)=-39-6a equation: 



3(-7-8a)=-39-6a

We move all terms to the left:

3(-7-8a)-(-39-6a)=0

We add all the numbers together, and all the variables

3(-8a-7)-(-6a-39)=0

We multiply parentheses

-24a-(-6a-39)-21=0

We get rid of parentheses

-24a+6a+39-21=0

We add all the numbers together, and all the variables

-18a+18=0

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

-18a=-18

a=-18/-18

a=1

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