Starting with:
w = ac / (a - c)
Multiplying both sides by (a - c):
w(a - c) = ac
Expanding the left side:
wa - wc = ac
Rearranging:
wa = ac + wc
Factoring out c on the right side:
wa = c(a + w)
Dividing both sides by (a + w):
c = wa / (a + w)
Therefore, c is equal to wa divided by the sum of a and w.
make c the subject of the formula. w=ac/a-c
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