-18=4a+2a

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Solution for -18=4a+2a equation: 



-18=4a+2a

We move all terms to the left:

-18-(4a+2a)=0

We add all the numbers together, and all the variables

-(+6a)-18=0

We get rid of parentheses

-6a-18=0

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

-6a=18

a=18/-6

a=-3

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