12=2a+15

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Solution for 12=2a+15 equation: 



12=2a+15

We move all terms to the left:

12-(2a+15)=0

We get rid of parentheses

-2a-15+12=0

We add all the numbers together, and all the variables

-2a-3=0

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

-2a=3

a=3/-2

a=-1+1/2

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