-6a-3(3a-4)=30

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Solution for -6a-3(3a-4)=30 equation: 



-6a-3(3a-4)=30

We move all terms to the left:

-6a-3(3a-4)-(30)=0

We multiply parentheses

-6a-9a+12-30=0

We add all the numbers together, and all the variables

-15a-18=0

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

-15a=18

a=18/-15

a=-1+1/5

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