(p-9)(p+4)=0

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Solution for (p-9)(p+4)=0 equation: 



(-9)(P+4)=0

We multiply parentheses ..

(-9P-36)=0

We get rid of parentheses

-9P-36=0

We move all terms containing P to the left, all other terms to the right

-9P=36

P=36/-9

P=-4

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