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-1+p/2=9
We move all terms to the left:
-1+p/2-(9)=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
p-20=0
We move all terms containing p to the left, all other terms to the right
p=20
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