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y in (-oo:+oo)
5/13 = y/12 // - y/12
5/13-(y/12) = 0
5/13-1/12*y = 0 // - 5/13
-1/12*y = -5/13 // : -1/12
y = -5/13/(-1/12)
y = 60/13
y = 60/13
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