13=3p-21+9p

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Solution for 13=3p-21+9p equation: 



13=3p-21+9p

We move all terms to the left:

13-(3p-21+9p)=0

We add all the numbers together, and all the variables

-(12p-21)+13=0

We get rid of parentheses

-12p+21+13=0

We add all the numbers together, and all the variables

-12p+34=0

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

-12p=-34

p=-34/-12

p=2+5/6

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