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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x-56)/x = 0.35 // - 0.35
(x-56)/x-0.35 = 0
(x-56)/x+(-0.35*x)/x = 0
x-0.35*x-56 = 0
0.65*x-56 = 0
(0.65*x-56)/x = 0
(0.65*x-56)/x = 0 // * x
0.65*x-56 = 0
0.65*x-56 = 0 // + 56
0.65*x = 56 // : 0.65
x = 56/0.65
x = 86.15384615
x = 86.15384615
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