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2.8p-12.4=-4
We move all terms to the left:
2.8p-12.4-(-4)=0
We add all the numbers together, and all the variables
2.8p-8.4=0
We move all terms containing p to the left, all other terms to the right
2.8p=8.4
p=8.4/2.8
p=3+1.7763568394003E-15/2.8
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