7p-9=10p-21

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Solution for 7p-9=10p-21 equation: 



7p-9=10p-21

We move all terms to the left:

7p-9-(10p-21)=0

We get rid of parentheses

7p-10p+21-9=0

We add all the numbers together, and all the variables

-3p+12=0

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

-3p=-12

p=-12/-3

p=+4

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