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31=3p-20
We move all terms to the left:
31-(3p-20)=0
We get rid of parentheses
-3p+20+31=0
We add all the numbers together, and all the variables
-3p+51=0
We move all terms containing p to the left, all other terms to the right
-3p=-51
p=-51/-3
p=+17
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