49/56=21/f

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Solution for 49/56=21/f equation: 


D( f )

f = 0

f = 0

f = 0

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

49/56 = 21/f // - 21/f

49/56-(21/f) = 0

49/56-21*f^-1 = 0

-21*f^-1 = -7/8 // : -21

f^-1 = 1/24

-1 < 0

1/(f^1) = 1/24 // * f^1

1 = 1/24*f^1 // : 1/24

24 = f^1

f = 24

f = 24

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