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2-4p+8=-7.5
We move all terms to the left:
2-4p+8-(-7.5)=0
We add all the numbers together, and all the variables
-4p+17.5=0
We move all terms containing p to the left, all other terms to the right
-4p=-17.5
p=-17.5/-4
p=4+1/2.6666666666667
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