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57=4x+7x+2
We move all terms to the left:
57-(4x+7x+2)=0
We add all the numbers together, and all the variables
-(11x+2)+57=0
We get rid of parentheses
-11x-2+57=0
We add all the numbers together, and all the variables
-11x+55=0
We move all terms containing x to the left, all other terms to the right
-11x=-55
x=-55/-11
x=+5
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