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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
32/35 = 96/x // - 96/x
32/35-(96/x) = 0
32/35-96*x^-1 = 0
-96*x^-1 = -32/35 // : -96
x^-1 = 1/105
-1 < 0
1/(x^1) = 1/105 // * x^1
1 = 1/105*x^1 // : 1/105
105 = x^1
x = 105
x = 105
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