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y in (-oo:+oo)
(4*(y-9))/5 = -2*y // + -2*y
(4*(y-9))/5-(-2*y) = 0
(4*(y-9))/5+2*y = 0
(4*(y-9))/5+(2*5*y)/5 = 0
4*(y-9)+2*5*y = 0
14*y-36 = 0
(14*y-36)/5 = 0
(14*y-36)/5 = 0 // * 5
14*y-36 = 0
14*y-36 = 0 // + 36
14*y = 36 // : 14
y = 36/14
y = 18/7
y = 18/7
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