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D( x )
6*x = 0
3*x = 0
6*x = 0
6*x = 0
6*x = 0 // : 6
x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
x in (-oo:0) U (0:+oo)
4/(3*x)+3/4 = 13/(6*x)+7/3 // - 13/(6*x)+7/3
4/(3*x)-(13/(6*x))+3/4-(7/3) = 0
4/(3*x)+(-13/6)*x^-1+3/4-7/3 = 0
-5/6*x^-1 = 19/12 // : -5/6
x^-1 = -19/10
-1 < 0
1/(x^1) = -19/10 // * x^1
1 = -19/10*x^1 // : -19/10
-10/19 = x^1
x = -10/19
x = -10/19
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