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2016=504+126x
We move all terms to the left:
2016-(504+126x)=0
We add all the numbers together, and all the variables
-(126x+504)+2016=0
We get rid of parentheses
-126x-504+2016=0
We add all the numbers together, and all the variables
-126x+1512=0
We move all terms containing x to the left, all other terms to the right
-126x=-1512
x=-1512/-126
x=+12
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