21+3p=12

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Solution for 21+3p=12 equation: 



21+3p=12

We move all terms to the left:

21+3p-(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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