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y in (-oo:+oo)
(9*(y-4))/5 = -4*y // + -4*y
(9*(y-4))/5-(-4*y) = 0
(9*(y-4))/5+4*y = 0
(9*(y-4))/5+(4*5*y)/5 = 0
9*(y-4)+4*5*y = 0
29*y-36 = 0
(29*y-36)/5 = 0
(29*y-36)/5 = 0 // * 5
29*y-36 = 0
29*y-36 = 0 // + 36
29*y = 36 // : 29
y = 36/29
y = 36/29
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