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9p=21p-6
We move all terms to the left:
9p-(21p-6)=0
We get rid of parentheses
9p-21p+6=0
We add all the numbers together, and all the variables
-12p+6=0
We move all terms containing p to the left, all other terms to the right
-12p=-6
p=-6/-12
p=1/2
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