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51=4a-a
We move all terms to the left:
51-(4a-a)=0
We add all the numbers together, and all the variables
-(+3a)+51=0
We get rid of parentheses
-3a+51=0
We move all terms containing a to the left, all other terms to the right
-3a=-51
a=-51/-3
a=+17
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