Solve for P
P=60
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1400-10P-20P=-400
Subtract 20P from both sides.
1400-30P=-400
Combine -10P and -20P to get -30P.
-30P=-400-1400
Subtract 1400 from both sides.
-30P=-1800
Subtract 1400 from -400 to get -1800.
P=\frac{-1800}{-30}
Divide both sides by -30.
P=60
Divide -1800 by -30 to get 60.
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