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-8.5x-3.5x=-78x=6.5
We move all terms to the left:
-8.5x-3.5x-(-78x)=0
We add all the numbers together, and all the variables
-12x-(-78x)=0
We get rid of parentheses
-12x+78x=0
We add all the numbers together, and all the variables
66x=0
x=0/66
x=0
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