4=t/21

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Solution for 4=t/21 equation: 


t in (-oo:+oo)

4 = t/21 // - t/21

4-(t/21) = 0

4-1/21*t = 0 // - 4

-1/21*t = -4 // : -1/21

t = -4/(-1/21)

t = 84

t = 84

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