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-91=-4p-9p
We move all terms to the left:
-91-(-4p-9p)=0
We add all the numbers together, and all the variables
-(-13p)-91=0
We get rid of parentheses
13p-91=0
We move all terms containing p to the left, all other terms to the right
13p=91
p=91/13
p=7
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