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-12+3a=38-2a
We move all terms to the left:
-12+3a-(38-2a)=0
We add all the numbers together, and all the variables
3a-(-2a+38)-12=0
We get rid of parentheses
3a+2a-38-12=0
We add all the numbers together, and all the variables
5a-50=0
We move all terms containing a to the left, all other terms to the right
5a=50
a=50/5
a=10
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