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6p-9=-2p+21
We move all terms to the left:
6p-9-(-2p+21)=0
We get rid of parentheses
6p+2p-21-9=0
We add all the numbers together, and all the variables
8p-30=0
We move all terms containing p to the left, all other terms to the right
8p=30
p=30/8
p=3+3/4
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