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5a-12=3a+7a=
We move all terms to the left:
5a-12-(3a+7a)=0
We add all the numbers together, and all the variables
5a-(+10a)-12=0
We get rid of parentheses
5a-10a-12=0
We add all the numbers together, and all the variables
-5a-12=0
We move all terms containing a to the left, all other terms to the right
-5a=12
a=12/-5
a=-2+2/5
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