Solve for p
p=2
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-4p-12=-20
Swap sides so that all variable terms are on the left hand side.
-4p=-20+12
Add 12 to both sides.
-4p=-8
Add -20 and 12 to get -8.
p=\frac{-8}{-4}
Divide both sides by -4.
p=2
Divide -8 by -4 to get 2.
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