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D( x )
x-6 = 0
x-6 = 0
x-6 = 0
x-6 = 0 // + 6
x = 6
x in (-oo:6) U (6:+oo)
4/(x-6) = 9/10 // - 9/10
4/(x-6)-(9/10) = 0
4/(x-6)-9/10 = 0
(4*10)/(10*(x-6))+(-9*(x-6))/(10*(x-6)) = 0
4*10-9*(x-6) = 0
94-9*x = 0
(94-9*x)/(10*(x-6)) = 0
(94-9*x)/(10*(x-6)) = 0 // * 10*(x-6)
94-9*x = 0
94-9*x = 0 // - 94
-9*x = -94 // : -9
x = -94/(-9)
x = 94/9
x = 94/9
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