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-20=7p-2p
We move all terms to the left:
-20-(7p-2p)=0
We add all the numbers together, and all the variables
-(+5p)-20=0
We get rid of parentheses
-5p-20=0
We move all terms containing p to the left, all other terms to the right
-5p=20
p=20/-5
p=-4
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