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20=50+2.5x
We move all terms to the left:
20-(50+2.5x)=0
We add all the numbers together, and all the variables
-(2.5x+50)+20=0
We get rid of parentheses
-2.5x-50+20=0
We add all the numbers together, and all the variables
-2.5x-30=0
We move all terms containing x to the left, all other terms to the right
-2.5x=30
x=30/-2.5
x=-12
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