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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2/3)/x = ((1/5)/1)/7 // - ((1/5)/1)/7
(2/3)/x-(((1/5)/1)/7) = 0
(2/3)/x-1/35 = 0
2/3*x^-1 = 1/35 // : 2/3
x^-1 = 3/70
-1 < 0
1/(x^1) = 3/70 // * x^1
1 = 3/70*x^1 // : 3/70
70/3 = x^1
x = 70/3
x = 70/3
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