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y in (-oo:+oo)
(1/2)*(6-y) = y // - y
(1/2)*(6-y)-y = 0
1/2*(6-y)-y = 0
1/2*(6-y)-y = 0
3-3/2*y = 0
3-3/2*y = 0
3-3/2*y = 0 // - 3
-3/2*y = -3 // : -3/2
y = -3/(-3/2)
y = 2
y = 2
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