4t+9=21

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Solution for 4t+9=21 equation: 


t in (-oo:+oo)

4*t+9 = 21 // - 21

4*t-21+9 = 0

4*t-12 = 0 // + 12

4*t = 12 // : 4

t = 12/4

t = 3

t = 3

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