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y in (-oo:+oo)
(9*(y-1))/4 = -4*y // + -4*y
(9*(y-1))/4-(-4*y) = 0
(9*(y-1))/4+4*y = 0
(9*(y-1))/4+(4*4*y)/4 = 0
9*(y-1)+4*4*y = 0
25*y-9 = 0
(25*y-9)/4 = 0
(25*y-9)/4 = 0 // * 4
25*y-9 = 0
25*y-9 = 0 // + 9
25*y = 9 // : 25
y = 9/25
y = 9/25
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