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y in (-oo:+oo)
(5*(4-y))/2 = -y // + y
(5*(4-y))/2+y = 0
(5*(4-y))/2+(2*y)/2 = 0
5*(4-y)+2*y = 0
20-3*y = 0
(20-3*y)/2 = 0
(20-3*y)/2 = 0 // * 2
20-3*y = 0
20-3*y = 0 // - 20
-3*y = -20 // : -3
y = -20/(-3)
y = 20/3
y = 20/3
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