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y in (-oo:+oo)
(3*3)/5 = y-(21/1) // - y-(21/1)
(3*3)/5-y+21/1 = 0
(3*3)/5-y+21 = 0
114/5-y = 0 // - 114/5
-y = -114/5 // * -1
y = 114/5
y = 114/5
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