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p-0.2p=72.80
We move all terms to the left:
p-0.2p-(72.80)=0
We add all the numbers together, and all the variables
p-0.2p-(72.8)=0
We add all the numbers together, and all the variables
0.8p-72.8=0
We move all terms containing p to the left, all other terms to the right
0.8p=72.8
p=72.8/0.8
p=90+0.8/0.8
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