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y in (-oo:+oo)
4/12 = y/9 // - y/9
4/12-(y/9) = 0
1/3-1/9*y = 0 // - 1/3
-1/9*y = -1/3 // : -1/9
y = -1/3/(-1/9)
y = 3
y = 3
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