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-13.5-11x=-87
We move all terms to the left:
-13.5-11x-(-87)=0
We add all the numbers together, and all the variables
-11x+73.5=0
We move all terms containing x to the left, all other terms to the right
-11x=-73.5
x=-73.5/-11
x=6+5/7.3333333333333
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