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-0.20p+0.4=-1.2
We move all terms to the left:
-0.20p+0.4-(-1.2)=0
We add all the numbers together, and all the variables
-0.2p+1.6=0
We move all terms containing p to the left, all other terms to the right
-0.2p=-1.6
p=-1.6/-0.2
p=+8
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