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x+20=-2x+41
We move all terms to the left:
x+20-(-2x+41)=0
We get rid of parentheses
x+2x-41+20=0
We add all the numbers together, and all the variables
3x-21=0
We move all terms containing x to the left, all other terms to the right
3x=21
x=21/3
x=7
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