-3t+9=21

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Solution for -3t+9=21 equation: 


t in (-oo:+oo)

9-3*t = 21 // - 21

9-3*t-21 = 0

-3*t-12 = 0 // + 12

-3*t = 12 // : -3

t = 12/(-3)

t = -4

t = -4

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