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3a=2a+3a+12+10
We move all terms to the left:
3a-(2a+3a+12+10)=0
We add all the numbers together, and all the variables
3a-(5a+22)=0
We get rid of parentheses
3a-5a-22=0
We add all the numbers together, and all the variables
-2a-22=0
We move all terms containing a to the left, all other terms to the right
-2a=22
a=22/-2
a=-11
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