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89=p/4+80
We move all terms to the left:
89-(p/4+80)=0
We get rid of parentheses
-p/4-80+89=0
We multiply all the terms by the denominator
-p-80*4+89*4=0
We add all the numbers together, and all the variables
-1p+36=0
We move all terms containing p to the left, all other terms to the right
-p=-36
p=-36/-1
p=+36
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