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