7/4=21/t

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Solution for 7/4=21/t equation: 


D( t )

t = 0

t = 0

t = 0

t in (-oo:0) U (0:+oo)

7/4 = 21/t // - 21/t

7/4-(21/t) = 0

7/4-21*t^-1 = 0

-21*t^-1 = -7/4 // : -21

t^-1 = 1/12

-1 < 0

1/(t^1) = 1/12 // * t^1

1 = 1/12*t^1 // : 1/12

12 = t^1

t = 12

t = 12

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