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3x+7=-2x+57
We move all terms to the left:
3x+7-(-2x+57)=0
We get rid of parentheses
3x+2x-57+7=0
We add all the numbers together, and all the variables
5x-50=0
We move all terms containing x to the left, all other terms to the right
5x=50
x=50/5
x=10
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