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y in (-oo:+oo)
(2*(y-8))/5 = -4*y // + -4*y
(2*(y-8))/5-(-4*y) = 0
(2*(y-8))/5+4*y = 0
(2*(y-8))/5+(4*5*y)/5 = 0
2*(y-8)+4*5*y = 0
22*y-16 = 0
(22*y-16)/5 = 0
(22*y-16)/5 = 0 // * 5
22*y-16 = 0
22*y-16 = 0 // + 16
22*y = 16 // : 22
y = 16/22
y = 8/11
y = 8/11
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