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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = -4/7 // + -4/7
5/x-(-4/7) = 0
5/x+4/7 = 0
5*x^-1 = -4/7 // : 5
x^-1 = -4/35
-1 < 0
1/(x^1) = -4/35 // * x^1
1 = -4/35*x^1 // : -4/35
-35/4 = x^1
x = -35/4
x = -35/4
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