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90p+5.1=1.2
We move all terms to the left:
90p+5.1-(1.2)=0
We add all the numbers together, and all the variables
90p+3.9=0
We move all terms containing p to the left, all other terms to the right
90p=-3.9
p=-3.9/90
p=-1/23.076923076923
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