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p/12+13=21
We move all terms to the left:
p/12+13-(21)=0
We add all the numbers together, and all the variables
p/12-8=0
We multiply all the terms by the denominator
p-8*12=0
We add all the numbers together, and all the variables
p-96=0
We move all terms containing p to the left, all other terms to the right
p=96
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