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X+10.5X=20
We move all terms to the left:
X+10.5X-(20)=0
We add all the numbers together, and all the variables
11.5X-20=0
We move all terms containing X to the left, all other terms to the right
11.5X=20
X=20/11.5
X=1+5.6666666666667/7.6666666666667
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