Solve for p
p=-2
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-4p+7=15
Swap sides so that all variable terms are on the left hand side.
-4p=15-7
Subtract 7 from both sides.
-4p=8
Subtract 7 from 15 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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