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y in (-oo:+oo)
-12 = y/2-2 // - y/2-2
2-(y/2)-12 = 0
-1/2*y-10 = 0 // + 10
-1/2*y = 10 // : -1/2
y = 10/(-1/2)
y = -20
y = -20
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