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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x+6/5 = 4/5 // - 4/5
4/x+6/5-(4/5) = 0
4/x+6/5-4/5 = 0
4*x^-1 = -2/5 // : 4
x^-1 = -1/10
-1 < 0
1/(x^1) = -1/10 // * x^1
1 = -1/10*x^1 // : -1/10
-10 = x^1
x = -10
x = -10
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