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Simplifying 160 * 3.14 = 2 * 3.14r * 10 Multiply 160 * 3.14 502.4 = 2 * 3.14r * 10 Reorder the terms for easier multiplication: 502.4 = 2 * 3.14 * 10r Multiply 2 * 3.14 502.4 = 6.28 * 10r Multiply 6.28 * 10 502.4 = 62.8r Solving 502.4 = 62.8r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-62.8r' to each side of the equation. 502.4 + -62.8r = 62.8r + -62.8r Combine like terms: 62.8r + -62.8r = 0.0 502.4 + -62.8r = 0.0 Add '-502.4' to each side of the equation. 502.4 + -502.4 + -62.8r = 0.0 + -502.4 Combine like terms: 502.4 + -502.4 = 0.0 0.0 + -62.8r = 0.0 + -502.4 -62.8r = 0.0 + -502.4 Combine like terms: 0.0 + -502.4 = -502.4 -62.8r = -502.4 Divide each side by '-62.8'. r = 8 Simplifying r = 8
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