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D( y )
5*y+2 = 0
5*y+2 = 0
5*y+2 = 0
5*y+2 = 0 // - 2
5*y = -2 // : 5
y = -2/5
y in (-oo:-2/5) U (-2/5:+oo)
(5*y+4)/2 = 4/(5*y+2) // - 4/(5*y+2)
(5*y+4)/2-(4/(5*y+2)) = 0
(5*y+4)/2-4*(5*y+2)^-1 = 0
(5*y+4)/2-4/(5*y+2) = 0
((5*y+4)*(5*y+2))/(2*(5*y+2))+(-4*2)/(2*(5*y+2)) = 0
(5*y+4)*(5*y+2)-4*2 = 0
25*y^2+30*y = 0
25*y^2+30*y = 0
5*y*(5*y+6) = 0
5*y+6 = 0 // - 6
5*y = -6 // : 5
y = -6/5
5*y*(y+6/5) = 0
(5*y*(y+6/5))/(2*(5*y+2)) = 0
(5*y*(y+6/5))/(2*(5*y+2)) = 0 // * 2*(5*y+2)
5*y*(y+6/5) = 0
( 5*y )
5*y = 0 // : 5
y = 0
( y+6/5 )
y+6/5 = 0 // - 6/5
y = -6/5
y in { 0, -6/5 }
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