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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+180/x = 29 // - 29
x+180/x-29 = 0
1*x^1+180*x^-1-29*x^0 = 0
(1*x^2-29*x^1+180*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-29*x^1+180*x^0) = 0
x^1
x^2-29*x+180 = 0
x^2-29*x+180 = 0
DELTA = (-29)^2-(1*4*180)
DELTA = 121
DELTA > 0
x = (121^(1/2)+29)/(1*2) or x = (29-121^(1/2))/(1*2)
x = 20 or x = 9
x in { 9, 20}
x in { 9, 20 }
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