20/14=90/t

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Solution for 20/14=90/t equation: 


D( t )

t = 0

t = 0

t = 0

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

20/14 = 90/t // - 90/t

20/14-(90/t) = 0

20/14-90*t^-1 = 0

-90*t^-1 = -10/7 // : -90

t^-1 = 1/63

-1 < 0

1/(t^1) = 1/63 // * t^1

1 = 1/63*t^1 // : 1/63

63 = t^1

t = 63

t = 63

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