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y in (-oo:+oo)
3/2 = (12/3)*y-(12/1) // - (12/3)*y-(12/1)
3/2-((12/3)*y)+12/1 = 0
3/2-4*y+12 = 0
27/2-4*y = 0 // - 27/2
-4*y = -27/2 // : -4
y = -27/2/(-4)
y = 27/8
y = 27/8
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