12+2a=3-a

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



12+2a=3-a

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

2a+1a-3+12=0

We add all the numbers together, and all the variables

3a+9=0

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

3a=-9

a=-9/3

a=-3

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