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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x = 7/x-6 // - 7/x-6
4/x-(7/x)+6 = 0
4/x-7*x^-1+6 = 0
-3*x^-1 = -6 // : -3
x^-1 = 2
-1 < 0
1/(x^1) = 2 // * x^1
1 = 2*x^1 // : 2
1/2 = x^1
x = 1/2
x = 1/2
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