3p+21=6p+12

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



3p+21=6p+12

We move all terms to the left:

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

We get rid of parentheses

3p-6p-12+21=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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