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D( x )
3*x = 0
2*x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
2*x = 0
2*x = 0
2*x = 0 // : 2
x = 0
x in (-oo:0) U (0:+oo)
5/(2*x)-(4/(3*x)) = 7/18 // - 7/18
5/(2*x)-(4/(3*x))-(7/18) = 0
5/(2*x)+(-4/3)*x^-1-7/18 = 0
7/6*x^-1 = 7/18 // : 7/6
x^-1 = 1/3
-1 < 0
1/(x^1) = 1/3 // * x^1
1 = 1/3*x^1 // : 1/3
3 = x^1
x = 3
x = 3
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