Solve for p
p=4
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300+40p+10p=500
Add 10p to both sides.
300+50p=500
Combine 40p and 10p to get 50p.
50p=500-300
Subtract 300 from both sides.
50p=200
Subtract 300 from 500 to get 200.
p=\frac{200}{50}
Divide both sides by 50.
p=4
Divide 200 by 50 to get 4.
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