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3.5x^2+126=42x.
We move all terms to the left:
3.5x^2+126-(42x.)=0
We add all the numbers together, and all the variables
3.5x^2-(+42x.)+126=0
We get rid of parentheses
3.5x^2-42x.+126=0
We move all terms containing x to the left, all other terms to the right
3.5x^2-42x.=-126
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