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15=20+p
We move all terms to the left:
15-(20+p)=0
We add all the numbers together, and all the variables
-(p+20)+15=0
We get rid of parentheses
-p-20+15=0
We add all the numbers together, and all the variables
-1p-5=0
We move all terms containing p to the left, all other terms to the right
-p=5
p=5/-1
p=-5
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