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Simplifying 9 = 2(3.14159) * r Multiply 2 * 3.14159 9 = 6.28318r Solving 9 = 6.28318r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-6.28318r' to each side of the equation. 9 + -6.28318r = 6.28318r + -6.28318r Combine like terms: 6.28318r + -6.28318r = 0.00000 9 + -6.28318r = 0.00000 Add '-9' to each side of the equation. 9 + -9 + -6.28318r = 0.00000 + -9 Combine like terms: 9 + -9 = 0 0 + -6.28318r = 0.00000 + -9 -6.28318r = 0.00000 + -9 Combine like terms: 0.00000 + -9 = -9 -6.28318r = -9 Divide each side by '-6.28318'. r = 1.432395698 Simplifying r = 1.432395698
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