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D( y )
y-3 = 0
y-3 = 0
y-3 = 0
y-3 = 0 // + 3
y = 3
y in (-oo:3) U (3:+oo)
2/(y-3) = 3/4 // - 3/4
2/(y-3)-(3/4) = 0
2/(y-3)-3/4 = 0
(2*4)/(4*(y-3))+(-3*(y-3))/(4*(y-3)) = 0
2*4-3*(y-3) = 0
17-3*y = 0
(17-3*y)/(4*(y-3)) = 0
(17-3*y)/(4*(y-3)) = 0 // * 4*(y-3)
17-3*y = 0
17-3*y = 0 // - 17
-3*y = -17 // : -3
y = -17/(-3)
y = 17/3
y = 17/3
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