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13=2p-9
We move all terms to the left:
13-(2p-9)=0
We get rid of parentheses
-2p+9+13=0
We add all the numbers together, and all the variables
-2p+22=0
We move all terms containing p to the left, all other terms to the right
-2p=-22
p=-22/-2
p=+11
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