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-5.4-7.8p=-78.408
We move all terms to the left:
-5.4-7.8p-(-78.408)=0
We add all the numbers together, and all the variables
-7.8p+73.008=0
We move all terms containing p to the left, all other terms to the right
-7.8p=-73.008
p=-73.008/-7.8
p=9+2.808/7.8
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