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y in (-oo:+oo)
(1*15)/6-(12*y) = 13 // - 13
(1*15)/6-(12*y)-13 = 0
15/6-12*y-13 = 0
-12*y-21/2 = 0 // + 21/2
-12*y = 21/2 // : -12
y = 21/2/(-12)
y = -7/8
y = -7/8
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