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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(5-x)/x+15 = 30 // - 30
(5-x)/x-30+15 = 0
(5-x)/x+(-30*x)/x+(15*x)/x = 0
15*x-x-30*x+5 = 0
15*x-31*x+5 = 0
5-16*x = 0
(5-16*x)/x = 0
(5-16*x)/x = 0 // * x
5-16*x = 0
5-16*x = 0 // - 5
-16*x = -5 // : -16
x = -5/(-16)
x = 5/16
x = 5/16
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