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D( y )
(-4*y)/(3-y)-4 = 0
3-y = 0
(-4*y)/(3-y)-4 = 0
(-4*y)/(3-y)-4 = 0
(-4*y)/(3-y)+(-4*(3-y))/(3-y) = 0
-4*(3-y)-4*y = 0
-12 = 0
-12/(3-y) = 0
-12/(3-y) = 0 // * 3-y
-12 = 0
-12 = 0
y belongs to the empty set
3-y = 0
3-y = 0
3-y = 0 // - 3
-y = -3 // * -1
y = 3
y in (-oo:3) U (3:+oo)
(3*((-4*y)/(3-y)))/((-4*y)/(3-y)-4) = 0
(-4*3*y)/((3-y)*((-4*y)/(3-y)-4)) = 0
(-4*y)/(3-y)-4 = 0
(-4*y)/(3-y)+(-4*(3-y))/(3-y) = 0
-4*(3-y)-4*y = 0
-12 = 0
-12/(3-y) = 0
-12/(3-y) = 0 // * 3-y
-12 = 0
(-4*3*y)/(-12*(3-y)) = 0
( -4*y )
-4*y = 0 // : -4
y = 0
( 3 )
3 = 0
y belongs to the empty set
y = 0
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