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-7+9p=p+1
We move all terms to the left:
-7+9p-(p+1)=0
We get rid of parentheses
9p-p-1-7=0
We add all the numbers together, and all the variables
8p-8=0
We move all terms containing p to the left, all other terms to the right
8p=8
p=8/8
p=1
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