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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/16 = 56/x // - 56/x
7/16-(56/x) = 0
7/16-56*x^-1 = 0
-56*x^-1 = -7/16 // : -56
x^-1 = 1/128
-1 < 0
1/(x^1) = 1/128 // * x^1
1 = 1/128*x^1 // : 1/128
128 = x^1
x = 128
x = 128
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