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y in (-oo:+oo)
(9*(4-y))/2 = -y // + y
(9*(4-y))/2+y = 0
(9*(4-y))/2+(2*y)/2 = 0
9*(4-y)+2*y = 0
36-7*y = 0
(36-7*y)/2 = 0
(36-7*y)/2 = 0 // * 2
36-7*y = 0
36-7*y = 0 // - 36
-7*y = -36 // : -7
y = -36/(-7)
y = 36/7
y = 36/7
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