3/7=21/f

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Solution for 3/7=21/f equation: 


D( f )

f = 0

f = 0

f = 0

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

3/7 = 21/f // - 21/f

3/7-(21/f) = 0

3/7-21*f^-1 = 0

-21*f^-1 = -3/7 // : -21

f^-1 = 1/49

-1 < 0

1/(f^1) = 1/49 // * f^1

1 = 1/49*f^1 // : 1/49

49 = f^1

f = 49

f = 49

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