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-2(p-7)=15
We move all terms to the left:
-2(p-7)-(15)=0
We multiply parentheses
-2p+14-15=0
We add all the numbers together, and all the variables
-2p-1=0
We move all terms containing p to the left, all other terms to the right
-2p=1
p=1/-2
p=-1/2
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