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100=x+0.5(x)
We move all terms to the left:
100-(x+0.5(x))=0
We add all the numbers together, and all the variables
-(+1.5x)+100=0
We get rid of parentheses
-1.5x+100=0
We move all terms containing x to the left, all other terms to the right
-1.5x=-100
x=-100/-1.5
x=66+1/1.5
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