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y in (-oo:+oo)
(7*(y-8))/5 = -4*y // + -4*y
(7*(y-8))/5-(-4*y) = 0
(7*(y-8))/5+4*y = 0
(7*(y-8))/5+(4*5*y)/5 = 0
7*(y-8)+4*5*y = 0
27*y-56 = 0
(27*y-56)/5 = 0
(27*y-56)/5 = 0 // * 5
27*y-56 = 0
27*y-56 = 0 // + 56
27*y = 56 // : 27
y = 56/27
y = 56/27
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