21=15e^1/2t

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Solution for 21=15e^1/2t equation: 


t in (-oo:+oo)

21 = ((15*e^1)/2)*t // - ((15*e^1)/2)*t

21-(((15*e^1)/2)*t) = 0

(-15/2)*e*t+21 = 0

21-15/2*e*t = 0 // - 21

-15/2*e*t = -21 // : -15/2*e

t = -21/(-15/2*e)

t = 14/5*e^-1

t = 14/5*e^-1

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