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