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y in (-oo:+oo)
3/11 = y/13 // - y/13
3/11-(y/13) = 0
3/11-1/13*y = 0 // - 3/11
-1/13*y = -3/11 // : -1/13
y = -3/11/(-1/13)
y = 39/11
y = 39/11
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