Rearranging the Equation & Isolating a Variable.

See attached file. The attached equation needs to be re-arranged such that the variable S is isolated (on the left side of the equation - eg: S=....).

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...

x + y
[1 - Cr] ------- [z + y] = z + y e [- (z + y) S]
x

x + y
[1 - Cr] ------- [z + y] - z = y e [- (z + y) S]
x

x + y
[1 - Cr] ------- [z + y] - z
x
= e [- (z + y) S]
y

x + y
[1 - Cr] ------- [z + y] - z
x
ln = ln e [- (z + y) ...