9-2t=21

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Solution for 9-2t=21 equation: 


t in (-oo:+oo)

9-(2*t) = 21 // - 21

9-(2*t)-21 = 0

9-2*t-21 = 0

-2*t-12 = 0 // + 12

-2*t = 12 // : -2

t = 12/(-2)

t = -6

t = -6

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