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y in (-oo:+oo)
(9*(y-3))/2 = -3*y // + -3*y
(9*(y-3))/2-(-3*y) = 0
(9*(y-3))/2+3*y = 0
(9*(y-3))/2+(2*3*y)/2 = 0
9*(y-3)+2*3*y = 0
15*y-27 = 0
(15*y-27)/2 = 0
(15*y-27)/2 = 0 // * 2
15*y-27 = 0
15*y-27 = 0 // + 27
15*y = 27 // : 15
y = 27/15
y = 9/5
y = 9/5
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