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y in (-oo:+oo)
11/3 = y/13 // - y/13
11/3-(y/13) = 0
11/3-1/13*y = 0 // - 11/3
-1/13*y = -11/3 // : -1/13
y = -11/3/(-1/13)
y = 143/3
y = 143/3
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