Solve for Q
Q=4000
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1200000+500Q-800Q=0
Subtract 800Q from both sides.
1200000-300Q=0
Combine 500Q and -800Q to get -300Q.
-300Q=-1200000
Subtract 1200000 from both sides. Anything subtracted from zero gives its negation.
Q=\frac{-1200000}{-300}
Divide both sides by -300.
Q=4000
Divide -1200000 by -300 to get 4000.
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