3/f=9/21

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Solution for 3/f=9/21 equation: 


D( f )

f = 0

f = 0

f = 0

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

3/f = 9/21 // - 9/21

3/f-(9/21) = 0

3/f-3/7 = 0

3*f^-1 = 3/7 // : 3

f^-1 = 1/7

-1 < 0

1/(f^1) = 1/7 // * f^1

1 = 1/7*f^1 // : 1/7

7 = f^1

f = 7

f = 7

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