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D( x )
-(4*x)-6 = 0
-(4*x)-6 = 0
-(4*x)-6 = 0
-4*x-6 = 0
-4*x-6 = 0 // + 6
-4*x = 6 // : -4
x = 6/(-4)
x = -3/2
x in (-oo:-3/2) U (-3/2:+oo)
(6*x-60)/(-(4*x)-6) = 0
(6*x-60)/(-4*x-6) = 0
6*x-60 = 0 // + 60
6*x = 60 // : 6
x = 60/6
x = 10
x = 10
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