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D( x )
3*x = 0
4*x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
4*x = 0
4*x = 0
4*x = 0 // : 4
x = 0
x in (-oo:0) U (0:+oo)
1/(4*x)-(1/(3*x)) = 1/8 // - 1/8
1/(4*x)-(1/(3*x))-(1/8) = 0
1/(4*x)+(-1/3)*x^-1-1/8 = 0
-1/12*x^-1 = 1/8 // : -1/12
x^-1 = -3/2
-1 < 0
1/(x^1) = -3/2 // * x^1
1 = -3/2*x^1 // : -3/2
-2/3 = x^1
x = -2/3
x = -2/3
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