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y in (-oo:+oo)
(4*(y-4))/5 = 4*y // - 4*y
(4*(y-4))/5-(4*y) = 0
(4*(y-4))/5-4*y = 0
(4*(y-4))/5+(-4*5*y)/5 = 0
4*(y-4)-4*5*y = 0
-16*y-16 = 0
(-16*y-16)/5 = 0
(-16*y-16)/5 = 0 // * 5
-16*y-16 = 0
-16*y-16 = 0 // + 16
-16*y = 16 // : -16
y = 16/(-16)
y = -1
y = -1
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