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y in (-oo:+oo)
11/9 = y/81 // - y/81
11/9-(y/81) = 0
11/9-1/81*y = 0 // - 11/9
-1/81*y = -11/9 // : -1/81
y = -11/9/(-1/81)
y = 99
y = 99
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