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2400x-170=1650x-420
We move all terms to the left:
2400x-170-(1650x-420)=0
We get rid of parentheses
2400x-1650x+420-170=0
We add all the numbers together, and all the variables
750x+250=0
We move all terms containing x to the left, all other terms to the right
750x=-250
x=-250/750
x=-1/3
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