6p+12=3p+21

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Solution for 6p+12=3p+21 equation: 



6p+12=3p+21

We move all terms to the left:

6p+12-(3p+21)=0

We get rid of parentheses

6p-3p-21+12=0

We add all the numbers together, and all the variables

3p-9=0

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

3p=9

p=9/3

p=3

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