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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)
(x-4)/(6-x) = 0.5 // - 0.5
(x-4)/(6-x)-0.5 = 0
(x-4)/(6-x)+(-0.5*(6-x))/(6-x) = 0
x-0.5*(6-x)-4 = 0
1.5*x-7 = 0
(1.5*x-7)/(6-x) = 0
(1.5*x-7)/(6-x) = 0 // * 6-x
1.5*x-7 = 0
1.5*x-7 = 0 // + 7
1.5*x = 7 // : 1.5
x = 7/1.5
x = 4.66666667
x = 4.66666667
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