2t+9=21

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Solution for 2t+9=21 equation: 


t in (-oo:+oo)

2*t+9 = 21 // - 21

2*t-21+9 = 0

2*t-12 = 0 // + 12

2*t = 12 // : 2

t = 12/2

t = 6

t = 6

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