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y in (-oo:+oo)
12*y-(((18*y)/(-6))*y)-6*y = 0
3*y^2-6*y+12*y = 0
3*y^2+6*y = 0
DELTA = 6^2-(0*3*4)
DELTA = 36
DELTA > 0
y = (36^(1/2)-6)/(2*3) or y = (-36^(1/2)-6)/(2*3)
y = 0 or y = -2
y in { -2, 0 }
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