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90-x+20=2x-50
We move all terms to the left:
90-x+20-(2x-50)=0
We add all the numbers together, and all the variables
-1x-(2x-50)+110=0
We get rid of parentheses
-1x-2x+50+110=0
We add all the numbers together, and all the variables
-3x+160=0
We move all terms containing x to the left, all other terms to the right
-3x=-160
x=-160/-3
x=53+1/3
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