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y in (-oo:+oo)
(2*(y-9))/5 = -4*y // + -4*y
(2*(y-9))/5-(-4*y) = 0
(2*(y-9))/5+4*y = 0
(2*(y-9))/5+(4*5*y)/5 = 0
2*(y-9)+4*5*y = 0
22*y-18 = 0
(22*y-18)/5 = 0
(22*y-18)/5 = 0 // * 5
22*y-18 = 0
22*y-18 = 0 // + 18
22*y = 18 // : 22
y = 18/22
y = 9/11
y = 9/11
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