-(3a+6)=18

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Solution for -(3a+6)=18 equation: 



-(3a+6)=18

We move all terms to the left:

-(3a+6)-(18)=0

We get rid of parentheses

-3a-6-18=0

We add all the numbers together, and all the variables

-3a-24=0

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

-3a=24

a=24/-3

a=-8

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