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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.3 = (x-5.6)/x // - (x-5.6)/x
0.3-((x-5.6)/x) = 0
(-1*(x-5.6))/x+0.3 = 0
(-1*(x-5.6))/x+(0.3*x)/x = 0
0.3*x-1*(x-5.6) = 0
5.6-0.7*x = 0
(5.6-0.7*x)/x = 0
(5.6-0.7*x)/x = 0 // * x
5.6-0.7*x = 0
5.6-0.7*x = 0 // - 5.6
-0.7*x = -5.6 // : -0.7
x = -5.6/(-0.7)
x = 8
x = 8
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