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D( x )
6-x = 0
6-x = 0
6-x = 0
6-x = 0 // - 6
-x = -6 // * -1
x = 6
x in (-oo:6) U (6:+oo)
60/30 = x/(6-x) // - x/(6-x)
60/30-(x/(6-x)) = 0
(-1*x)/(6-x)+2 = 0
(-1*x)/(6-x)+(2*(6-x))/(6-x) = 0
2*(6-x)-1*x = 0
12-3*x = 0
(12-3*x)/(6-x) = 0
(12-3*x)/(6-x) = 0 // * 6-x
12-3*x = 0
12-3*x = 0 // - 12
-3*x = -12 // : -3
x = -12/(-3)
x = 4
x = 4
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