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((-8*b)/6)*b+b*((5*y)/6)+((9*b)/9)*b-(b*((5*y)/9))-1 = 0
((-8*b)/6)*b+b*((5*y)/6)+((9*b)/9)*b+(-5/9)*b*y-1 = 0
5/18*b*y-1/3*b^2-1 = 0
x naleu017Cy do R
x in (-oo:+oo)
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