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y in (-oo:+oo)
-2*y-5 = 5/2 // - 5/2
-2*y-(5/2)-5 = 0
-2*y-5/2-5 = 0
-2*y-15/2 = 0 // + 15/2
-2*y = 15/2 // : -2
y = 15/2/(-2)
y = -15/4
y = -15/4
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