12=2a-18

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Solution for 12=2a-18 equation: 



12=2a-18

We move all terms to the left:

12-(2a-18)=0

We get rid of parentheses

-2a+18+12=0

We add all the numbers together, and all the variables

-2a+30=0

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

-2a=-30

a=-30/-2

a=+15

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