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y in (-oo:+oo)
(2/5)*y+y-8 = 11 // - 11
(2/5)*y+y-11-8 = 0
7/5*y-19 = 0 // + 19
7/5*y = 19 // : 7/5
y = 19/7/5
y = 95/7
y = 95/7
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