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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
45/35 = 20/x // - 20/x
45/35-(20/x) = 0
45/35-20*x^-1 = 0
-20*x^-1 = -9/7 // : -20
x^-1 = 9/140
-1 < 0
1/(x^1) = 9/140 // * x^1
1 = 9/140*x^1 // : 9/140
140/9 = x^1
x = 140/9
x = 140/9
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