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y in (-oo:+oo)
3/11 = y/7 // - y/7
3/11-(y/7) = 0
3/11-1/7*y = 0 // - 3/11
-1/7*y = -3/11 // : -1/7
y = -3/11/(-1/7)
y = 21/11
y = 21/11
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