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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/3 = (14.25-x)/x // - (14.25-x)/x
6/3-((14.25-x)/x) = 0
(-1*(14.25-x))/x+2 = 0
(-1*(14.25-x))/x+(2*x)/x = 0
2*x-1*(14.25-x) = 0
3*x-14.25 = 0
(3*x-14.25)/x = 0
(3*x-14.25)/x = 0 // * x
3*x-14.25 = 0
3*x-14.25 = 0 // + 14.25
3*x = 14.25 // : 3
x = 14.25/3
x = 4.75
x = 4.75
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