20/7=60/t

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Solution for 20/7=60/t equation: 


D( t )

t = 0

t = 0

t = 0

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

20/7 = 60/t // - 60/t

20/7-(60/t) = 0

20/7-60*t^-1 = 0

-60*t^-1 = -20/7 // : -60

t^-1 = 1/21

-1 < 0

1/(t^1) = 1/21 // * t^1

1 = 1/21*t^1 // : 1/21

21 = t^1

t = 21

t = 21

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