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85x-0.5x-45x+300=50
We move all terms to the left:
85x-0.5x-45x+300-(50)=0
We add all the numbers together, and all the variables
39.5x+250=0
We move all terms containing x to the left, all other terms to the right
39.5x=-250
x=-250/39.5
x=-6+1/3.0384615384615
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