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y in (-oo:+oo)
(8*(y-5))/5 = -4*y // + -4*y
(8*(y-5))/5-(-4*y) = 0
(8*(y-5))/5+4*y = 0
(8*(y-5))/5+(4*5*y)/5 = 0
8*(y-5)+4*5*y = 0
28*y-40 = 0
(28*y-40)/5 = 0
(28*y-40)/5 = 0 // * 5
28*y-40 = 0
28*y-40 = 0 // + 40
28*y = 40 // : 28
y = 40/28
y = 10/7
y = 10/7
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