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D( y )
y-20 = 0
y-20 = 0
y-20 = 0
y-20 = 0 // + 20
y = 20
y in (-oo:20) U (20:+oo)
((5/2)*y+20)/(y-20) = 3 // - 3
((5/2)*y+20)/(y-20)-3 = 0
(5/2*y+20)/(y-20)-3 = 0
(5/2*y+20)/(y-20)+(-3*(y-20))/(y-20) = 0
5/2*y-3*(y-20)+20 = 0
80-1/2*y = 0
(80-1/2*y)/(y-20) = 0
(80-1/2*y)/(y-20) = 0 // * y-20
80-1/2*y = 0
80-1/2*y = 0 // - 80
-1/2*y = -80 // : -1/2
y = -80/(-1/2)
y = 160
y = 160
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