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(3p-12)=90
We move all terms to the left:
(3p-12)-(90)=0
We get rid of parentheses
3p-12-90=0
We add all the numbers together, and all the variables
3p-102=0
We move all terms containing p to the left, all other terms to the right
3p=102
p=102/3
p=34
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