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20=8.5x
We move all terms to the left:
20-(8.5x)=0
We add all the numbers together, and all the variables
-(+8.5x)+20=0
We get rid of parentheses
-8.5x+20=0
We move all terms containing x to the left, all other terms to the right
-8.5x=-20
x=-20/-8.5
x=2+3/8.5
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