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y in (-oo:+oo)
((9*y)/2)*y+1 = 9 // - 9
((9*y)/2)*y-9+1 = 0
9/2*y^2 = 8 // : 9/2
y^2 = 16/9
y^2 = 16/9 // ^ 1/2
abs(y) = 4/3
y = 4/3 or y = -4/3
y in { 4/3, -4/3 }
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