s/9-s/21=1/9

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Solution for s/9-s/21=1/9 equation: 


s in (-oo:+oo)

s/9-(s/21) = 1/9 // - 1/9

s/9-(s/21)-(1/9) = 0

s/9-(s/21)-1/9 = 0

4/63*s-1/9 = 0 // + 1/9

4/63*s = 1/9 // : 4/63

s = 1/9/4/63

s = 7/4

s = 7/4

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