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20x+31=2x+49
We move all terms to the left:
20x+31-(2x+49)=0
We get rid of parentheses
20x-2x-49+31=0
We add all the numbers together, and all the variables
18x-18=0
We move all terms containing x to the left, all other terms to the right
18x=18
x=18/18
x=1
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