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y in (-oo:+oo)
13/11 = y/12 // - y/12
13/11-(y/12) = 0
13/11-1/12*y = 0 // - 13/11
-1/12*y = -13/11 // : -1/12
y = -13/11/(-1/12)
y = 156/11
y = 156/11
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