21=t+4t-9

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Solution for 21=t+4t-9 equation: 


t in (-oo:+oo)

21 = t+4*t-9 // - t+4*t-9

9-t-(4*t)+21 = 0

9-t-4*t+21 = 0

30-5*t = 0 // - 30

-5*t = -30 // : -5

t = -30/(-5)

t = 6

t = 6

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