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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15/x+9/17 = 0
15*x^-1 = -9/17 // : 15
x^-1 = -3/85
-1 < 0
1/(x^1) = -3/85 // * x^1
1 = -3/85*x^1 // : -3/85
-85/3 = x^1
x = -85/3
x = -85/3
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