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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x+5)/x = 7 // - 7
(x+5)/x-7 = 0
(x+5)/x+(-7*x)/x = 0
x-7*x+5 = 0
5-6*x = 0
(5-6*x)/x = 0
(5-6*x)/x = 0 // * x
5-6*x = 0
5-6*x = 0 // - 5
-6*x = -5 // : -6
x = -5/(-6)
x = 5/6
x = 5/6
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