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y in (-oo:+oo)
2*y^2-((4/2)*y^2)-(7*y)-(9*y)-5 = 0
2*y^2-2*y^2-7*y-9*y-5 = 0
-16*y-5 = 0 // + 5
-16*y = 5 // : -16
y = 5/(-16)
y = -5/16
y = -5/16
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