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P in (-oo:+oo)
4 = (P^1-5)/40 // - (P^1-5)/40
4-((P^1-5)/40) = 0
4-((P-5)/40) = 0
(-1*(P-5))/40+4 = 0
(-1*(P-5))/40+(4*40)/40 = 0
4*40-1*(P-5) = 0
165-P = 0
(165-P)/40 = 0
(165-P)/40 = 0 // * 40
165-P = 0
165-P = 0 // - 165
-P = -165 // * -1
P = 165
P = 165
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