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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
110-(56/x) = 0
110-56*x^-1 = 0
-56*x^-1 = -110 // : -56
x^-1 = 55/28
-1 < 0
1/(x^1) = 55/28 // * x^1
1 = 55/28*x^1 // : 55/28
28/55 = x^1
x = 28/55
x = 28/55
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