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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x+180)/x = 1.2 // - 1.2
(x+180)/x-1.2 = 0
(x+180)/x+(-1.2*x)/x = 0
x-1.2*x+180 = 0
180-0.2*x = 0
(180-0.2*x)/x = 0
(180-0.2*x)/x = 0 // * x
180-0.2*x = 0
180-0.2*x = 0 // - 180
-0.2*x = -180 // : -0.2
x = -180/(-0.2)
x = 900
x = 900
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