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3x-18=x+50
We move all terms to the left:
3x-18-(x+50)=0
We get rid of parentheses
3x-x-50-18=0
We add all the numbers together, and all the variables
2x-68=0
We move all terms containing x to the left, all other terms to the right
2x=68
x=68/2
x=34
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