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y in (-oo:+oo)
(3*y)/8-9 = (13*y)/8 // - (13*y)/8
(3*y)/8-((13*y)/8)-9 = 0
(3*y)/8+(-13/8)*y-9 = 0
-5/4*y-9 = 0 // + 9
-5/4*y = 9 // : -5/4
y = 9/(-5/4)
y = -36/5
y = -36/5
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