20p+p-21p+3p-p=12

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Solution for 20p+p-21p+3p-p=12 equation: 



20p+p-21p+3p-p=12

We move all terms to the left:

20p+p-21p+3p-p-(12)=0

We add all the numbers together, and all the variables

2p-12=0

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

2p=12

p=12/2

p=6

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