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)=0

We get rid of parentheses

4p+2p-9=0

We add all the numbers together, and all the variables

6p-9=0

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

6p=9

p=9/6

p=1+1/2

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