7p+21=13p+15

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Solution for 7p+21=13p+15 equation: 



7p+21=13p+15

We move all terms to the left:

7p+21-(13p+15)=0

We get rid of parentheses

7p-13p-15+21=0

We add all the numbers together, and all the variables

-6p+6=0

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

-6p=-6

p=-6/-6

p=1

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