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y in (-oo:+oo)
(1/2)*y = y-12 // - y-12
(1/2)*y-y+12 = 0
12-1/2*y = 0 // - 12
-1/2*y = -12 // : -1/2
y = -12/(-1/2)
y = 24
y = 24
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