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D( x )
x-3 = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:3) U (3:+oo)
(x+15)/(x-3) = 1.62 // - 1.62
(x+15)/(x-3)-1.62 = 0
(x+15)/(x-3)+(-1.62*(x-3))/(x-3) = 0
x-1.62*(x-3)+15 = 0
19.86-0.62*x = 0
(19.86-0.62*x)/(x-3) = 0
(19.86-0.62*x)/(x-3) = 0 // * x-3
19.86-0.62*x = 0
19.86-0.62*x = 0 // - 19.86
-0.62*x = -19.86 // : -0.62
x = -19.86/(-0.62)
x = 32.03225806
x = 32.03225806
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