9p+21=84

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Solution for 9p+21=84 equation: 



9p+21=84

We move all terms to the left:

9p+21-(84)=0

We add all the numbers together, and all the variables

9p-63=0

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

9p=63

p=63/9

p=7

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