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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(180*(x-2))/x = 165 // - 165
(180*(x-2))/x-165 = 0
(180*(x-2))/x+(-165*x)/x = 0
180*(x-2)-165*x = 0
15*x-360 = 0
(15*x-360)/x = 0
(15*x-360)/x = 0 // * x
15*x-360 = 0
15*x-360 = 0 // + 360
15*x = 360 // : 15
x = 360/15
x = 24
x = 24
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