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6-12=4a-20
We move all terms to the left:
6-12-(4a-20)=0
We add all the numbers together, and all the variables
-(4a-20)-6=0
We get rid of parentheses
-4a+20-6=0
We add all the numbers together, and all the variables
-4a+14=0
We move all terms containing a to the left, all other terms to the right
-4a=-14
a=-14/-4
a=3+1/2
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