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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)
(6*x+7)/(4*x-1) = 2 // - 2
(6*x+7)/(4*x-1)-2 = 0
(6*x+7)/(4*x-1)+(-2*(4*x-1))/(4*x-1) = 0
6*x-2*(4*x-1)+7 = 0
9-2*x = 0
(9-2*x)/(4*x-1) = 0
(9-2*x)/(4*x-1) = 0 // * 4*x-1
9-2*x = 0
9-2*x = 0 // - 9
-2*x = -9 // : -2
x = -9/(-2)
x = 9/2
x = 9/2
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