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D( x )
3*x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
x in (-oo:0) U (0:+oo)
5/(3*x) = 2/7 // - 2/7
5/(3*x)-(2/7) = 0
5/(3*x)-2/7 = 0
5/3*x^-1 = 2/7 // : 5/3
x^-1 = 6/35
-1 < 0
1/(x^1) = 6/35 // * x^1
1 = 6/35*x^1 // : 6/35
35/6 = x^1
x = 35/6
x = 35/6
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