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12+2.5p=8
We move all terms to the left:
12+2.5p-(8)=0
We add all the numbers together, and all the variables
2.5p+4=0
We move all terms containing p to the left, all other terms to the right
2.5p=-4
p=-4/2.5
p=-1+1/1.6666666666667
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