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t in (-oo:+oo)
2*t^2-((12/4)*t^2)-(2*t)-16+12 = 0
2*t^2-3*t^2-2*t-16+12 = 0
-t^2-2*t-4 = 0
DELTA = (-2)^2-(-4*(-1)*4)
DELTA = -12
DELTA < 0
t belongs to the empty set
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