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-8.5x-3.5x=-7.8
We move all terms to the left:
-8.5x-3.5x-(-7.8)=0
We add all the numbers together, and all the variables
-12x+7.8=0
We move all terms containing x to the left, all other terms to the right
-12x=-7.8
x=-7.8/-12
x=4.3333333333333/6.6666666666667
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