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5x-20=-2x+71
We move all terms to the left:
5x-20-(-2x+71)=0
We get rid of parentheses
5x+2x-71-20=0
We add all the numbers together, and all the variables
7x-91=0
We move all terms containing x to the left, all other terms to the right
7x=91
x=91/7
x=13
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