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y in (-oo:+oo)
(3*(y-4))/5 = -4*y // + -4*y
(3*(y-4))/5-(-4*y) = 0
(3*(y-4))/5+4*y = 0
(3*(y-4))/5+(4*5*y)/5 = 0
3*(y-4)+4*5*y = 0
23*y-12 = 0
(23*y-12)/5 = 0
(23*y-12)/5 = 0 // * 5
23*y-12 = 0
23*y-12 = 0 // + 12
23*y = 12 // : 23
y = 12/23
y = 12/23
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