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p in (-oo:+oo)
(1.05*p)/1.05 = 84/1.05 // - 84/1.05
(1.05*p)/1.05-(84/1.05) = 0
(1.05*p)/1.05-80 = 0
p-80 = 0 // + 80
p = 80
p = 80
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