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