4p+9=21

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Solution for 4p+9=21 equation: 



4p+9=21

We move all terms to the left:

4p+9-(21)=0

We add all the numbers together, and all the variables

4p-12=0

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

4p=12

p=12/4

p=3

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