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y in (-oo:+oo)
(5*(y-2))/4 = -4*y // + -4*y
(5*(y-2))/4-(-4*y) = 0
(5*(y-2))/4+4*y = 0
(5*(y-2))/4+(4*4*y)/4 = 0
5*(y-2)+4*4*y = 0
21*y-10 = 0
(21*y-10)/4 = 0
(21*y-10)/4 = 0 // * 4
21*y-10 = 0
21*y-10 = 0 // + 10
21*y = 10 // : 21
y = 10/21
y = 10/21
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