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Simplifying S = 3.14z(R + r) S = (R * 3.14z + r * 3.14z) Reorder the terms: S = (3.14rz + 3.14zR) S = (3.14rz + 3.14zR) Solving S = 3.14rz + 3.14zR Solving for variable 'S'. Move all terms containing S to the left, all other terms to the right. Simplifying S = 3.14rz + 3.14zR
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