18=12+2a

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Solution for 18=12+2a equation: 



18=12+2a

We move all terms to the left:

18-(12+2a)=0

We add all the numbers together, and all the variables

-(2a+12)+18=0

We get rid of parentheses

-2a-12+18=0

We add all the numbers together, and all the variables

-2a+6=0

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

-2a=-6

a=-6/-2

a=+3

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