Solve for p
p=-22.5
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p=\frac{-9}{0.4}
Divide both sides by 0.4.
p=\frac{-90}{4}
Expand \frac{-9}{0.4} by multiplying both numerator and the denominator by 10.
p=-\frac{45}{2}
Reduce the fraction \frac{-90}{4} to lowest terms by extracting and canceling out 2.
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