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y in (-oo:+oo)
(2*y)/9 = 1/4 // - 1/4
(2*y)/9-(1/4) = 0
(2*y)/9-1/4 = 0
2/9*y-1/4 = 0 // + 1/4
2/9*y = 1/4 // : 2/9
y = 1/4/2/9
y = 9/8
y = 9/8
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