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100=X+3X+.5X
We move all terms to the left:
100-(X+3X+.5X)=0
We add all the numbers together, and all the variables
-(+4.5X)+100=0
We get rid of parentheses
-4.5X+100=0
We move all terms containing X to the left, all other terms to the right
-4.5X=-100
X=-100/-4.5
X=22+1/4.5
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