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D( x )
4*x-6 = 0
4*x-2 = 0
4*x-6 = 0
4*x-6 = 0
4*x-6 = 0 // + 6
4*x = 6 // : 4
x = 6/4
x = 3/2
4*x-2 = 0
4*x-2 = 0
4*x-2 = 0 // + 2
4*x = 2 // : 4
x = 2/4
x = 1/2
x in (-oo:1/2) U (1/2:3/2) U (3/2:+oo)
4/(4*x-6) = 7/(4*x-2) // - 7/(4*x-2)
4/(4*x-6)-(7/(4*x-2)) = 0
4/(4*x-6)-7*(4*x-2)^-1 = 0
4/(4*x-6)-7/(4*x-2) = 0
(4*(4*x-2))/((4*x-6)*(4*x-2))+(-7*(4*x-6))/((4*x-6)*(4*x-2)) = 0
4*(4*x-2)-7*(4*x-6) = 0
34-12*x = 0
(34-12*x)/((4*x-6)*(4*x-2)) = 0
(34-12*x)/((4*x-6)*(4*x-2)) = 0 // * (4*x-6)*(4*x-2)
34-12*x = 0
34-12*x = 0 // - 34
-12*x = -34 // : -12
x = -34/(-12)
x = 17/6
x = 17/6
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