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y in (-oo:+oo)
(3*y)/(-9) = y/8+13 // - y/8+13
(3*y)/(-9)-(y/8)-13 = 0
-11/24*y-13 = 0 // + 13
-11/24*y = 13 // : -11/24
y = 13/(-11/24)
y = -312/11
y = -312/11
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