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170=x-0.8x
We move all terms to the left:
170-(x-0.8x)=0
We add all the numbers together, and all the variables
-(+0.2x)+170=0
We get rid of parentheses
-0.2x+170=0
We move all terms containing x to the left, all other terms to the right
-0.2x=-170
x=-170/-0.2
x=+850
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