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180=x-0.2x
We move all terms to the left:
180-(x-0.2x)=0
We add all the numbers together, and all the variables
-(+0.8x)+180=0
We get rid of parentheses
-0.8x+180=0
We move all terms containing x to the left, all other terms to the right
-0.8x=-180
x=-180/-0.8
x=+225
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