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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(360-x)/x = 40 // - 40
(360-x)/x-40 = 0
(360-x)/x+(-40*x)/x = 0
360-x-40*x = 0
360-41*x = 0
(360-41*x)/x = 0
(360-41*x)/x = 0 // * x
360-41*x = 0
360-41*x = 0 // - 360
-41*x = -360 // : -41
x = -360/(-41)
x = 360/41
x = 360/41
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