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816=0.20x+x
We move all terms to the left:
816-(0.20x+x)=0
We add all the numbers together, and all the variables
-(+1.2x)+816=0
We get rid of parentheses
-1.2x+816=0
We move all terms containing x to the left, all other terms to the right
-1.2x=-816
x=-816/-1.2
x=+680
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