Solve for x
x=200
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2400+30x-42x=0
Subtract 42x from both sides.
2400-12x=0
Combine 30x and -42x to get -12x.
-12x=-2400
Subtract 2400 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-2400}{-12}
Divide both sides by -12.
x=200
Divide -2400 by -12 to get 200.
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