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