4/7=f/21

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Solution for 4/7=f/21 equation: 


f in (-oo:+oo)

4/7 = f/21 // - f/21

4/7-(f/21) = 0

4/7-1/21*f = 0 // - 4/7

-1/21*f = -4/7 // : -1/21

f = -4/7/(-1/21)

f = 12

f = 12

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