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-8.5x+(-0.4)=-2.8
We move all terms to the left:
-8.5x+(-0.4)-(-2.8)=0
We add all the numbers together, and all the variables
-8.5x+2.4=0
We move all terms containing x to the left, all other terms to the right
-8.5x=-2.4
x=-2.4/-8.5
x=1/3.5416666666667
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