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8.67x-4.87-35.39=78.21
We move all terms to the left:
8.67x-4.87-35.39-(78.21)=0
We add all the numbers together, and all the variables
8.67x-118.47=0
We move all terms containing x to the left, all other terms to the right
8.67x=118.47
x=118.47/8.67
x=13+3.27272727273/4.92613636364
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