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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
35/x = 25/7 // - 25/7
35/x-(25/7) = 0
35/x-25/7 = 0
35*x^-1 = 25/7 // : 35
x^-1 = 5/49
-1 < 0
1/(x^1) = 5/49 // * x^1
1 = 5/49*x^1 // : 5/49
49/5 = x^1
x = 49/5
x = 49/5
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