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y in (-oo:+oo)
9*(y+3) = 18/5 // - 18/5
9*(y+3)-(18/5) = 0
9*(y+3)-18/5 = 0
(5*9*(y+3))/5-18/5 = 0
5*9*(y+3)-18 = 0
45*y+117 = 0
(45*y+117)/5 = 0
(45*y+117)/5 = 0 // * 5
45*y+117 = 0
45*y+117 = 0 // - 117
45*y = -117 // : 45
y = -117/45
y = -13/5
y = -13/5
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