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X+0.5X+1=21
We move all terms to the left:
X+0.5X+1-(21)=0
We add all the numbers together, and all the variables
1.5X-20=0
We move all terms containing X to the left, all other terms to the right
1.5X=20
X=20/1.5
X=13+0.5/1.5
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