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13.6=x+.5x+.75x
We move all terms to the left:
13.6-(x+.5x+.75x)=0
We add all the numbers together, and all the variables
-(+2.25x)+13.6=0
We get rid of parentheses
-2.25x+13.6=0
We move all terms containing x to the left, all other terms to the right
-2.25x=-13.6
x=-13.6/-2.25
x=6+0.1/2.25
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