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D( x )
x-6 = 0
x = 0
x-6 = 0
x-6 = 0
x-6 = 0 // + 6
x = 6
x = 0
x = 0
x in (-oo:0) U (0:6) U (6:+oo)
340/(x-6) = 360/x // - 360/x
340/(x-6)-(360/x) = 0
340/(x-6)-360*x^-1 = 0
340/(x-6)-360/x = 0
(340*x)/(x*(x-6))+(-360*(x-6))/(x*(x-6)) = 0
340*x-360*(x-6) = 0
2160-20*x = 0
(2160-20*x)/(x*(x-6)) = 0
(2160-20*x)/(x*(x-6)) = 0 // * x*(x-6)
2160-20*x = 0
2160-20*x = 0 // - 2160
-20*x = -2160 // : -20
x = -2160/(-20)
x = 108
x = 108
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