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D( x )
4*x-5 = 0
4*x-5 = 0
4*x-5 = 0
4*x-5 = 0 // + 5
4*x = 5 // : 4
x = 5/4
x in (-oo:5/4) U (5/4:+oo)
(2*x-3)/(4*x-5) = 6 // - 6
(2*x-3)/(4*x-5)-6 = 0
(2*x-3)/(4*x-5)+(-6*(4*x-5))/(4*x-5) = 0
2*x-6*(4*x-5)-3 = 0
27-22*x = 0
(27-22*x)/(4*x-5) = 0
(27-22*x)/(4*x-5) = 0 // * 4*x-5
27-22*x = 0
27-22*x = 0 // - 27
-22*x = -27 // : -22
x = -27/(-22)
x = 27/22
x = 27/22
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