21+3p=90

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Solution for 21+3p=90 equation: 



21+3p=90

We move all terms to the left:

21+3p-(90)=0

We add all the numbers together, and all the variables

3p-69=0

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

3p=69

p=69/3

p=23

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