57/63=f/21

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Solution for 57/63=f/21 equation: 


f in (-oo:+oo)

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

57/63-(f/21) = 0

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

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

f = -19/21/(-1/21)

f = 19

f = 19

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