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2p-5=10p-21
We move all terms to the left:
2p-5-(10p-21)=0
We get rid of parentheses
2p-10p+21-5=0
We add all the numbers together, and all the variables
-8p+16=0
We move all terms containing p to the left, all other terms to the right
-8p=-16
p=-16/-8
p=+2
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