3(p+1)=21

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Solution for 3(p+1)=21 equation: 



3(p+1)=21

We move all terms to the left:

3(p+1)-(21)=0

We multiply parentheses

3p+3-21=0

We add all the numbers together, and all the variables

3p-18=0

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

3p=18

p=18/3

p=6

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