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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
37/7 = 25/x // - 25/x
37/7-(25/x) = 0
37/7-25*x^-1 = 0
-25*x^-1 = -37/7 // : -25
x^-1 = 37/175
-1 < 0
1/(x^1) = 37/175 // * x^1
1 = 37/175*x^1 // : 37/175
175/37 = x^1
x = 175/37
x = 175/37
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