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80=0.2x+50=0.1x+75
We move all terms to the left:
80-(0.2x+50)=0
We get rid of parentheses
-0.2x-50+80=0
We add all the numbers together, and all the variables
-0.2x+30=0
We move all terms containing x to the left, all other terms to the right
-0.2x=-30
x=-30/-0.2
x=+150
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