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y in (-oo:+oo)
(4*(y-2))/5 = 4*y // - 4*y
(4*(y-2))/5-(4*y) = 0
(4*(y-2))/5-4*y = 0
(4*(y-2))/5+(-4*5*y)/5 = 0
4*(y-2)-4*5*y = 0
-16*y-8 = 0
(-16*y-8)/5 = 0
(-16*y-8)/5 = 0 // * 5
-16*y-8 = 0
-16*y-8 = 0 // + 8
-16*y = 8 // : -16
y = 8/(-16)
y = -1/2
y = -1/2
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