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x-15=2x-57
We move all terms to the left:
x-15-(2x-57)=0
We get rid of parentheses
x-2x+57-15=0
We add all the numbers together, and all the variables
-1x+42=0
We move all terms containing x to the left, all other terms to the right
-x=-42
x=-42/-1
x=+42
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