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x+18+x+20=x+50
We move all terms to the left:
x+18+x+20-(x+50)=0
We add all the numbers together, and all the variables
2x-(x+50)+38=0
We get rid of parentheses
2x-x-50+38=0
We add all the numbers together, and all the variables
x-12=0
We move all terms containing x to the left, all other terms to the right
x=12
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