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