12=-18+6a

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Solution for 12=-18+6a equation: 



12=-18+6a

We move all terms to the left:

12-(-18+6a)=0

We add all the numbers together, and all the variables

-(6a-18)+12=0

We get rid of parentheses

-6a+18+12=0

We add all the numbers together, and all the variables

-6a+30=0

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

-6a=-30

a=-30/-6

a=+5

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