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y in (-oo:+oo)
(9*(y-4))/5 = -3*y // + -3*y
(9*(y-4))/5-(-3*y) = 0
(9*(y-4))/5+3*y = 0
(9*(y-4))/5+(3*5*y)/5 = 0
9*(y-4)+3*5*y = 0
24*y-36 = 0
(24*y-36)/5 = 0
(24*y-36)/5 = 0 // * 5
24*y-36 = 0
24*y-36 = 0 // + 36
24*y = 36 // : 24
y = 36/24
y = 3/2
y = 3/2
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