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210=x+.2x
We move all terms to the left:
210-(x+.2x)=0
We add all the numbers together, and all the variables
-(+1.2x)+210=0
We get rid of parentheses
-1.2x+210=0
We move all terms containing x to the left, all other terms to the right
-1.2x=-210
x=-210/-1.2
x=+175
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