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12=p-8+3p
We move all terms to the left:
12-(p-8+3p)=0
We add all the numbers together, and all the variables
-(4p-8)+12=0
We get rid of parentheses
-4p+8+12=0
We add all the numbers together, and all the variables
-4p+20=0
We move all terms containing p to the left, all other terms to the right
-4p=-20
p=-20/-4
p=+5
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