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t in (-oo:+oo)
(36*t^2)/3+(36*t^1)/3+9 = 0
(36*t^2)/3+(36*t)/3+9 = 0
12*t^2+12*t+9 = 0
DELTA = 12^2-(4*9*12)
DELTA = -288
DELTA < 0
t belongs to the empty set
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