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21x-11=210.5
We move all terms to the left:
21x-11-(210.5)=0
We add all the numbers together, and all the variables
21x-221.5=0
We move all terms containing x to the left, all other terms to the right
21x=221.5
x=221.5/21
x=10+7.6666666666667/14
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