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-9p=6p+21
We move all terms to the left:
-9p-(6p+21)=0
We get rid of parentheses
-9p-6p-21=0
We add all the numbers together, and all the variables
-15p-21=0
We move all terms containing p to the left, all other terms to the right
-15p=21
p=21/-15
p=-1+2/5
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