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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)
(30-(10*x))/(6-x) = 0
(30-10*x)/(6-x) = 0
30-10*x = 0 // - 30
-10*x = -30 // : -10
x = -30/(-10)
x = 3
x = 3
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