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