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-8.5x-3.5=-78
We move all terms to the left:
-8.5x-3.5-(-78)=0
We add all the numbers together, and all the variables
-8.5x+74.5=0
We move all terms containing x to the left, all other terms to the right
-8.5x=-74.5
x=-74.5/-8.5
x=8+2.6/3.4
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