-21=-13p+31

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Solution for -21=-13p+31 equation: 



-21=-13p+31

We move all terms to the left:

-21-(-13p+31)=0

We get rid of parentheses

13p-31-21=0

We add all the numbers together, and all the variables

13p-52=0

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

13p=52

p=52/13

p=4

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