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y in (-oo:+oo)
(11*y)/2-((5*y)/6) = 28 // - 28
(11*y)/2-((5*y)/6)-28 = 0
(11*y)/2+(-5/6)*y-28 = 0
14/3*y-28 = 0 // + 28
14/3*y = 28 // : 14/3
y = 28/14/3
y = 6
y = 6
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