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