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y in (-oo:+oo)
(50-y)/9 = y // - y
(50-y)/9-y = 0
(50-y)/9+(9*(-y))/9 = 0
9*(-y)-y+50 = 0
50-10*y = 0
(50-10*y)/9 = 0
(50-10*y)/9 = 0 // * 9
50-10*y = 0
50-10*y = 0 // - 50
-10*y = -50 // : -10
y = -50/(-10)
y = 5
y = 5
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