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y in (-oo:+oo)
(3*(4-y))/5 = y // - y
(3*(4-y))/5-y = 0
(3*(4-y))/5+(5*(-y))/5 = 0
3*(4-y)+5*(-y) = 0
12-8*y = 0
(12-8*y)/5 = 0
(12-8*y)/5 = 0 // * 5
12-8*y = 0
12-8*y = 0 // - 12
-8*y = -12 // : -8
y = -12/(-8)
y = 3/2
y = 3/2
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