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90=0.2x
We move all terms to the left:
90-(0.2x)=0
We add all the numbers together, and all the variables
-(+0.2x)+90=0
We get rid of parentheses
-0.2x+90=0
We move all terms containing x to the left, all other terms to the right
-0.2x=-90
x=-90/-0.2
x=+450
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