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t in (-oo:+oo)
7/4-t^2-(3*t) = 0
7/4-t^2-3*t = 0
7/4-t^2-3*t = 0
DELTA = (-3)^2-(-1*7/4*4)
DELTA = 16
DELTA > 0
t = (16^(1/2)+3)/(-1*2) or t = (3-16^(1/2))/(-1*2)
t = -7/2 or t = 1/2
t in { -7/2, 1/2 }
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