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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(3*x+25)/x-5+7 = 3/x // - 3/x
(3*x+25)/x-(3/x)-5+7 = 0
(3*x+25)/x-3*x^-1-5+7 = 0
(3*x+25)/x-3/x-5+7 = 0
(3*x+25)/x-3/x+(-5*x)/x+(7*x)/x = 0
3*x-5*x+7*x-3+25 = 0
3*x-5*x+7*x+22 = 0
7*x-2*x+22 = 0
5*x+22 = 0
(5*x+22)/x = 0
(5*x+22)/x = 0 // * x
5*x+22 = 0
5*x+22 = 0 // - 22
5*x = -22 // : 5
x = -22/5
x = -22/5
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