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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)
3*x-((18/(6-x))*(x-6)) = 0
3*x-18*(6-x)^-1*(x-6) = 0
(-18*(x-6))/(6-x)+3*x = 0
(-18*(x-6))/(6-x)+(3*x*(6-x))/(6-x) = 0
3*x*(6-x)-18*(x-6) = 0
108-3*x^2 = 0
(108-3*x^2)/(6-x) = 0
(108-3*x^2)/(6-x) = 0 // * 6-x
108-3*x^2 = 0
-3*x^2 = -108 // : -3
x^2 = 36
x^2 = 36 // ^ 1/2
abs(x) = 6
x = 6 or x = -6
x in { 6}
x = -6
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