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-8.5x+0.58=-6.22
We move all terms to the left:
-8.5x+0.58-(-6.22)=0
We add all the numbers together, and all the variables
-8.5x+6.8=0
We move all terms containing x to the left, all other terms to the right
-8.5x=-6.8
x=-6.8/-8.5
x=2.4285714285714/3.0357142857143
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