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-4=-p/20
We move all terms to the left:
-4-(-p/20)=0
We get rid of parentheses
p/20-4=0
We multiply all the terms by the denominator
p-4*20=0
We add all the numbers together, and all the variables
p-80=0
We move all terms containing p to the left, all other terms to the right
p=80
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