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y in (-oo:+oo)
(5*(y-3))/4 = -4*y // + -4*y
(5*(y-3))/4-(-4*y) = 0
(5*(y-3))/4+4*y = 0
(5*(y-3))/4+(4*4*y)/4 = 0
5*(y-3)+4*4*y = 0
21*y-15 = 0
(21*y-15)/4 = 0
(21*y-15)/4 = 0 // * 4
21*y-15 = 0
21*y-15 = 0 // + 15
21*y = 15 // : 21
y = 15/21
y = 5/7
y = 5/7
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