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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x-123)/x = -1.8 // + 1.8
(x-123)/x+1.8 = 0
(x-123)/x+(1.8*x)/x = 0
x+1.8*x-123 = 0
2.8*x-123 = 0
(2.8*x-123)/x = 0
(2.8*x-123)/x = 0 // * x
2.8*x-123 = 0
2.8*x-123 = 0 // + 123
2.8*x = 123 // : 2.8
x = 123/2.8
x = 43.92857143
x = 43.92857143
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