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