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D( x )
3*x-1 = 0
3*x-1 = 0
3*x-1 = 0
3*x-1 = 0 // + 1
3*x = 1 // : 3
x = 1/3
x in (-oo:1/3) U (1/3:+oo)
(2*x-4)/(3*x-1) = 4/5 // - 4/5
(2*x-4)/(3*x-1)-(4/5) = 0
(2*x-4)/(3*x-1)-4/5 = 0
(5*(2*x-4))/(5*(3*x-1))+(-4*(3*x-1))/(5*(3*x-1)) = 0
5*(2*x-4)-4*(3*x-1) = 0
-2*x-16 = 0
(-2*x-16)/(5*(3*x-1)) = 0
(-2*x-16)/(5*(3*x-1)) = 0 // * 5*(3*x-1)
-2*x-16 = 0
-2*x-16 = 0 // + 16
-2*x = 16 // : -2
x = 16/(-2)
x = -8
x = -8
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