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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
28/49 = 32/x // - 32/x
28/49-(32/x) = 0
28/49-32*x^-1 = 0
-32*x^-1 = -4/7 // : -32
x^-1 = 1/56
-1 < 0
1/(x^1) = 1/56 // * x^1
1 = 1/56*x^1 // : 1/56
56 = x^1
x = 56
x = 56
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