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2.5+0.15p=0.4
We move all terms to the left:
2.5+0.15p-(0.4)=0
We add all the numbers together, and all the variables
0.15p+2.1=0
We move all terms containing p to the left, all other terms to the right
0.15p=-2.1
p=-2.1/0.15
p=-14
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