3-a=12-2a

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Solution for 3-a=12-2a equation: 



3-a=12-2a

We move all terms to the left:

3-a-(12-2a)=0

We add all the numbers together, and all the variables

-a-(-2a+12)+3=0

We add all the numbers together, and all the variables

-1a-(-2a+12)+3=0

We get rid of parentheses

-1a+2a-12+3=0

We add all the numbers together, and all the variables

a-9=0

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

a=9

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