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-0.87x=13.92
We move all terms to the left:
-0.87x-(13.92)=0
We add all the numbers together, and all the variables
-0.87x-13.92=0
We move all terms containing x to the left, all other terms to the right
-0.87x=13.92
x=13.92/-0.87
x=-16
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