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y in (-oo:+oo)
(5*(6-y))/3 = -y // + y
(5*(6-y))/3+y = 0
(5*(6-y))/3+(3*y)/3 = 0
5*(6-y)+3*y = 0
30-2*y = 0
(30-2*y)/3 = 0
(30-2*y)/3 = 0 // * 3
30-2*y = 0
30-2*y = 0 // - 30
-2*y = -30 // : -2
y = -30/(-2)
y = 15
y = 15
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