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y in (-oo:+oo)
(9*(y-8))/4 = -4*y // + -4*y
(9*(y-8))/4-(-4*y) = 0
(9*(y-8))/4+4*y = 0
(9*(y-8))/4+(4*4*y)/4 = 0
9*(y-8)+4*4*y = 0
25*y-72 = 0
(25*y-72)/4 = 0
(25*y-72)/4 = 0 // * 4
25*y-72 = 0
25*y-72 = 0 // + 72
25*y = 72 // : 25
y = 72/25
y = 72/25
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