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30-2p=30+2p
We move all terms to the left:
30-2p-(30+2p)=0
We add all the numbers together, and all the variables
-2p-(2p+30)+30=0
We get rid of parentheses
-2p-2p-30+30=0
We add all the numbers together, and all the variables
-4p=0
p=0/-4
p=0
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