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100=0.2x+90
We move all terms to the left:
100-(0.2x+90)=0
We get rid of parentheses
-0.2x-90+100=0
We add all the numbers together, and all the variables
-0.2x+10=0
We move all terms containing x to the left, all other terms to the right
-0.2x=-10
x=-10/-0.2
x=+50
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