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-15=4x-57
We move all terms to the left:
-15-(4x-57)=0
We get rid of parentheses
-4x+57-15=0
We add all the numbers together, and all the variables
-4x+42=0
We move all terms containing x to the left, all other terms to the right
-4x=-42
x=-42/-4
x=10+1/2
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