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9-p/2=-1
We move all terms to the left:
9-p/2-(-1)=0
We add all the numbers together, and all the variables
-p/2+10=0
We multiply all the terms by the denominator
-p+10*2=0
We add all the numbers together, and all the variables
-1p+20=0
We move all terms containing p to the left, all other terms to the right
-p=-20
p=-20/-1
p=+20
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