12=5a+2-a

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Solution for 12=5a+2-a equation: 



12=5a+2-a

We move all terms to the left:

12-(5a+2-a)=0

We add all the numbers together, and all the variables

-(4a+2)+12=0

We get rid of parentheses

-4a-2+12=0

We add all the numbers together, and all the variables

-4a+10=0

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

-4a=-10

a=-10/-4

a=2+1/2

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