4p-9=-2p-21

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Solution for 4p-9=-2p-21 equation: 



4p-9=-2p-21

We move all terms to the left:

4p-9-(-2p-21)=0

We get rid of parentheses

4p+2p+21-9=0

We add all the numbers together, and all the variables

6p+12=0

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

6p=-12

p=-12/6

p=-2

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