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y in (-oo:+oo)
(7*(y-3))/5 = -4*y // + -4*y
(7*(y-3))/5-(-4*y) = 0
(7*(y-3))/5+4*y = 0
(7*(y-3))/5+(4*5*y)/5 = 0
7*(y-3)+4*5*y = 0
27*y-21 = 0
(27*y-21)/5 = 0
(27*y-21)/5 = 0 // * 5
27*y-21 = 0
27*y-21 = 0 // + 21
27*y = 21 // : 27
y = 21/27
y = 7/9
y = 7/9
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