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D( y )
3*y-1 = 0
3*y-1 = 0
3*y-1 = 0
3*y-1 = 0 // + 1
3*y = 1 // : 3
y = 1/3
y in (-oo:1/3) U (1/3:+oo)
10/(3*y-1) = 12/6 // - 12/6
10/(3*y-1)-(12/6) = 0
10/(3*y-1)-2 = 0
10/(3*y-1)+(-2*(3*y-1))/(3*y-1) = 0
10-2*(3*y-1) = 0
12-6*y = 0
(12-6*y)/(3*y-1) = 0
(12-6*y)/(3*y-1) = 0 // * 3*y-1
12-6*y = 0
12-6*y = 0 // - 12
-6*y = -12 // : -6
y = -12/(-6)
y = 2
y = 2
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