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y in (-oo:+oo)
9 = 6*y-(18/4) // - 6*y-(18/4)
18/4-(6*y)+9 = 0
18/4-6*y+9 = 0
27/2-6*y = 0 // - 27/2
-6*y = -27/2 // : -6
y = -27/2/(-6)
y = 9/4
y = 9/4
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