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y in (-oo:+oo)
(4*(y-1))/5 = -4*y // + -4*y
(4*(y-1))/5-(-4*y) = 0
(4*(y-1))/5+4*y = 0
(4*(y-1))/5+(4*5*y)/5 = 0
4*(y-1)+4*5*y = 0
24*y-4 = 0
(24*y-4)/5 = 0
(24*y-4)/5 = 0 // * 5
24*y-4 = 0
24*y-4 = 0 // + 4
24*y = 4 // : 24
y = 4/24
y = 1/6
y = 1/6
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