3/7=S/21

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Solution for 3/7=S/21 equation: 


S in (-oo:+oo)

3/7 = S/21 // - S/21

3/7-(S/21) = 0

3/7-1/21*S = 0 // - 3/7

-1/21*S = -3/7 // : -1/21

S = -3/7/(-1/21)

S = 9

S = 9

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