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y in (-oo:+oo)
3/12 = y/18 // - y/18
3/12-(y/18) = 0
1/4-1/18*y = 0 // - 1/4
-1/18*y = -1/4 // : -1/18
y = -1/4/(-1/18)
y = 9/2
y = 9/2
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