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9=2.25p
We move all terms to the left:
9-(2.25p)=0
We add all the numbers together, and all the variables
-(+2.25p)+9=0
We get rid of parentheses
-2.25p+9=0
We move all terms containing p to the left, all other terms to the right
-2.25p=-9
p=-9/-2.25
p=+4
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