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7.5x-13.7=53.8
We move all terms to the left:
7.5x-13.7-(53.8)=0
We add all the numbers together, and all the variables
7.5x-67.5=0
We move all terms containing x to the left, all other terms to the right
7.5x=67.5
x=67.5/7.5
x=9
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