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p/2+15=12
We move all terms to the left:
p/2+15-(12)=0
We add all the numbers together, and all the variables
p/2+3=0
We multiply all the terms by the denominator
p+3*2=0
We add all the numbers together, and all the variables
p+6=0
We move all terms containing p to the left, all other terms to the right
p=-6
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