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2x-1.75x=42.5
We move all terms to the left:
2x-1.75x-(42.5)=0
We add all the numbers together, and all the variables
0.25x-42.5=0
We move all terms containing x to the left, all other terms to the right
0.25x=42.5
x=42.5/0.25
x=170
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