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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((180*x-1800)/x)*(x-20) = 0
((180*x-1800)*(x-20))/x = 0
( 180*x-1800 )
180*x-1800 = 0 // + 1800
180*x = 1800 // : 180
x = 1800/180
x = 10
( x-20 )
x-20 = 0 // + 20
x = 20
x in { 10, 20 }
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