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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(180*(x-2))/x = 162 // - 162
(180*(x-2))/x-162 = 0
(180*(x-2))/x+(-162*x)/x = 0
180*(x-2)-162*x = 0
18*x-360 = 0
(18*x-360)/x = 0
(18*x-360)/x = 0 // * x
18*x-360 = 0
18*x-360 = 0 // + 360
18*x = 360 // : 18
x = 360/18
x = 20
x = 20
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