Solve for p
p=0
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4p-0.5-5p=-0.5
Subtract 5p from both sides.
-p-0.5=-0.5
Combine 4p and -5p to get -p.
-p=-0.5+0.5
Add 0.5 to both sides.
-p=0
Add -0.5 and 0.5 to get 0.
p=0
Product of two numbers is equal to 0 if at least one of them is 0. Since -1 is not equal to 0, p must be equal to 0.
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