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3=p-90/2
We move all terms to the left:
3-(p-90/2)=0
We add all the numbers together, and all the variables
-(p-45)+3=0
We get rid of parentheses
-p+45+3=0
We add all the numbers together, and all the variables
-1p+48=0
We move all terms containing p to the left, all other terms to the right
-p=-48
p=-48/-1
p=+48
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