45=30t-10t^2/2

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Solution for 45=30t-10t^2/2 equation: 


t in (-oo:+oo)

45 = 30*t-((10*t^2)/2) // - 30*t-((10*t^2)/2)

(10*t^2)/2-(30*t)+45 = 0

(10*t^2)/2-30*t+45 = 0

5*t^2-30*t+45 = 0

DELTA = (-30)^2-(4*5*45)

DELTA = 0

t = 30/(2*5)

t = 3 or t = 3

t in { 3, 3 }

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