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13-p=p-13
We move all terms to the left:
13-p-(p-13)=0
We add all the numbers together, and all the variables
-1p-(p-13)+13=0
We get rid of parentheses
-1p-p+13+13=0
We add all the numbers together, and all the variables
-2p+26=0
We move all terms containing p to the left, all other terms to the right
-2p=-26
p=-26/-2
p=+13
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