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y in (-oo:+oo)
(9*y)/2 = 3*y-6 // - 3*y-6
(9*y)/2-(3*y)+6 = 0
(9*y)/2-3*y+6 = 0
3/2*y+6 = 0 // - 6
3/2*y = -6 // : 3/2
y = -6/3/2
y = -4
y = -4
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