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3.5-0.03x=-0.58
We move all terms to the left:
3.5-0.03x-(-0.58)=0
We add all the numbers together, and all the variables
-0.03x+4.08=0
We move all terms containing x to the left, all other terms to the right
-0.03x=-4.08
x=-4.08/-0.03
x=+136
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