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y in (-oo:+oo)
5*y-(8*y)-(1/2) = 11/2 // - 11/2
5*y-(8*y)-(1/2)-(11/2) = 0
5*y-8*y-1/2-11/2 = 0
-3*y-6 = 0 // + 6
-3*y = 6 // : -3
y = 6/(-3)
y = -2
y = -2
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