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y in (-oo:+oo)
4*y = 9*y-(5/2) // - 9*y-(5/2)
4*y-(9*y)+5/2 = 0
4*y-9*y+5/2 = 0
5/2-5*y = 0 // - 5/2
-5*y = -5/2 // : -5
y = -5/2/(-5)
y = 1/2
y = 1/2
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