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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
Y = (T+6)/x // - (T+6)/x
Y-((T+6)/x) = 0
(-1*(T+6))/x+Y = 0
(-1*(T+6))/x+(Y*x)/x = 0
Y*x-1*(T+6) = 0
Y*x-T-6 = 0
(Y*x-T-6)/x = 0
(Y*x-T-6)/x = 0 // * x
Y*x-T-6 = 0
Y*x-T-6 = 0 // + -T-6
Y*x = -(-T-6) // : Y
x = (-(-T-6))/Y
x = (T+6)/Y
x = (T+6)/Y
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