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y in (-oo:+oo)
3/12 = y/8 // - y/8
3/12-(y/8) = 0
1/4-1/8*y = 0 // - 1/4
-1/8*y = -1/4 // : -1/8
y = -1/4/(-1/8)
y = 2
y = 2
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