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