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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2.5 = (540-x)/x // - (540-x)/x
2.5-((540-x)/x) = 0
(-1*(540-x))/x+2.5 = 0
(-1*(540-x))/x+(2.5*x)/x = 0
2.5*x-1*(540-x) = 0
3.5*x-540 = 0
(3.5*x-540)/x = 0
(3.5*x-540)/x = 0 // * x
3.5*x-540 = 0
3.5*x-540 = 0 // + 540
3.5*x = 540 // : 3.5
x = 540/3.5
x = 154.28571429
x = 154.28571429
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