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42=11x-57
We move all terms to the left:
42-(11x-57)=0
We get rid of parentheses
-11x+57+42=0
We add all the numbers together, and all the variables
-11x+99=0
We move all terms containing x to the left, all other terms to the right
-11x=-99
x=-99/-11
x=+9
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