f/21=57/63

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Solution for f/21=57/63 equation: 


f in (-oo:+oo)

f/21 = 57/63 // - 57/63

f/21-(57/63) = 0

f/21-19/21 = 0

1/21*f-19/21 = 0 // + 19/21

1/21*f = 19/21 // : 1/21

f = 19/21/1/21

f = 19

f = 19

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