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y in (-oo:+oo)
(8*(y-4))/5 = -4*y // + -4*y
(8*(y-4))/5-(-4*y) = 0
(8*(y-4))/5+4*y = 0
(8*(y-4))/5+(4*5*y)/5 = 0
8*(y-4)+4*5*y = 0
28*y-32 = 0
(28*y-32)/5 = 0
(28*y-32)/5 = 0 // * 5
28*y-32 = 0
28*y-32 = 0 // + 32
28*y = 32 // : 28
y = 32/28
y = 8/7
y = 8/7
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