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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x-5)/x = 1.12 // - 1.12
(x-5)/x-1.12 = 0
(x-5)/x+(-1.12*x)/x = 0
x-1.12*x-5 = 0
-0.12*x-5 = 0
(-0.12*x-5)/x = 0
(-0.12*x-5)/x = 0 // * x
-0.12*x-5 = 0
-0.12*x-5 = 0 // + 5
-0.12*x = 5 // : -0.12
x = 5/(-0.12)
x = -41.66666667
x = -41.66666667
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