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31 January, 10:53

Rearrange the formula S = a / (a - r) for r.

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  1. 31 January, 14:39
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    S = a / (a - r)

    s (a - r) = a

    sa - sr = a

    sr = sa - a

    sr = a (s - 1)

    r = (a (s - 1)) / s
  2. 31 January, 14:51
    0
    S = a / (a - r) ... multiply both sides by (a - r)

    S (a - r) = a

    Sa - Sr = a

    Sa - a = Sr

    (Sa - a) / S = r or it could be : (aS - a) / S = r
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