21/28=s/4

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Solution for 21/28=s/4 equation: 


s in (-oo:+oo)

21/28 = s/4 // - s/4

21/28-(s/4) = 0

3/4-1/4*s = 0 // - 3/4

-1/4*s = -3/4 // : -1/4

s = -3/4/(-1/4)

s = 3

s = 3

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