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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/7 = 35/x // - 35/x
2/7-(35/x) = 0
2/7-35*x^-1 = 0
-35*x^-1 = -2/7 // : -35
x^-1 = 2/245
-1 < 0
1/(x^1) = 2/245 // * x^1
1 = 2/245*x^1 // : 2/245
245/2 = x^1
x = 245/2
x = 245/2
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