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D( x )
4*x-1 = 0
4*x-1 = 0
4*x-1 = 0
4*x-1 = 0 // + 1
4*x = 1 // : 4
x = 1/4
x in (-oo:1/4) U (1/4:+oo)
(3*x)/(4*x-1) = 14/8 // - 14/8
(3*x)/(4*x-1)-(14/8) = 0
(3*x)/(4*x-1)-7/4 = 0
(3*4*x)/(4*(4*x-1))+(-7*(4*x-1))/(4*(4*x-1)) = 0
3*4*x-7*(4*x-1) = 0
7-16*x = 0
(7-16*x)/(4*(4*x-1)) = 0
(7-16*x)/(4*(4*x-1)) = 0 // * 4*(4*x-1)
7-16*x = 0
7-16*x = 0 // - 7
-16*x = -7 // : -16
x = -7/(-16)
x = 7/16
x = 7/16
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