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-8.5x+0.69=-2.71
We move all terms to the left:
-8.5x+0.69-(-2.71)=0
We add all the numbers together, and all the variables
-8.5x+3.4=0
We move all terms containing x to the left, all other terms to the right
-8.5x=-3.4
x=-3.4/-8.5
x=2.4285714285714/6.0714285714286
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