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13+2a=3a-12+2a
We move all terms to the left:
13+2a-(3a-12+2a)=0
We add all the numbers together, and all the variables
2a-(5a-12)+13=0
We get rid of parentheses
2a-5a+12+13=0
We add all the numbers together, and all the variables
-3a+25=0
We move all terms containing a to the left, all other terms to the right
-3a=-25
a=-25/-3
a=8+1/3
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