Solve for P
P=3
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10-0P=-20+10P
Multiply 0 and 5 to get 0.
10-0=-20+10P
Anything times zero gives zero.
10=-20+10P
Subtract 0 from 10 to get 10.
-20+10P=10
Swap sides so that all variable terms are on the left hand side.
10P=10+20
Add 20 to both sides.
10P=30
Add 10 and 20 to get 30.
P=\frac{30}{10}
Divide both sides by 10.
P=3
Divide 30 by 10 to get 3.
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