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129=9p+3
We move all terms to the left:
129-(9p+3)=0
We get rid of parentheses
-9p-3+129=0
We add all the numbers together, and all the variables
-9p+126=0
We move all terms containing p to the left, all other terms to the right
-9p=-126
p=-126/-9
p=+14
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