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D( x )
6-(4*x) = 0
6-(4*x) = 0
6-(4*x) = 0
6-4*x = 0
6-4*x = 0 // - 6
-4*x = -6 // : -4
x = -6/(-4)
x = 3/2
x in (-oo:3/2) U (3/2:+oo)
5 = 9/(6-(4*x)) // - 9/(6-(4*x))
5-(9/(6-(4*x))) = 0
5-9*(6-4*x)^-1 = 0
5-9/(6-4*x) = 0
(5*(6-4*x))/(6-4*x)-9/(6-4*x) = 0
5*(6-4*x)-9 = 0
21-20*x = 0
(21-20*x)/(6-4*x) = 0
(21-20*x)/(6-4*x) = 0 // * 6-4*x
21-20*x = 0
21-20*x = 0 // - 21
-20*x = -21 // : -20
x = -21/(-20)
x = 21/20
x = 21/20
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