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