S=PIr(r+s)

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Solution for S=PIr(r+s) equation: 


Simplifying
S = PIr(r + s)
S = (r * rIP + s * rIP)

Reorder the terms:
S = (rsIP + r2IP)
S = (rsIP + r2IP)

Solving
S = rsIP + r2IP

Solving for variable 'S'.

Move all terms containing S to the left, all other terms to the right.

Simplifying
S = rsIP + r2IP

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