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p in (-oo:+oo)
(20*p)/3 = 3*40 // - 3*40
(20*p)/3-(3*40) = 0
(20*p)/3-120 = 0
20/3*p-120 = 0 // + 120
20/3*p = 120 // : 20/3
p = 120/20/3
p = 18
p = 18
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