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12-a-3=5a+2
We move all terms to the left:
12-a-3-(5a+2)=0
We add all the numbers together, and all the variables
-1a-(5a+2)+9=0
We get rid of parentheses
-1a-5a-2+9=0
We add all the numbers together, and all the variables
-6a+7=0
We move all terms containing a to the left, all other terms to the right
-6a=-7
a=-7/-6
a=1+1/6
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