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Simplifying 140 * 3.13 = 2 * 3.14r * 10 Multiply 140 * 3.13 438.2 = 2 * 3.14r * 10 Reorder the terms for easier multiplication: 438.2 = 2 * 3.14 * 10r Multiply 2 * 3.14 438.2 = 6.28 * 10r Multiply 6.28 * 10 438.2 = 62.8r Solving 438.2 = 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. 438.2 + -62.8r = 62.8r + -62.8r Combine like terms: 62.8r + -62.8r = 0.0 438.2 + -62.8r = 0.0 Add '-438.2' to each side of the equation. 438.2 + -438.2 + -62.8r = 0.0 + -438.2 Combine like terms: 438.2 + -438.2 = 0.0 0.0 + -62.8r = 0.0 + -438.2 -62.8r = 0.0 + -438.2 Combine like terms: 0.0 + -438.2 = -438.2 -62.8r = -438.2 Divide each side by '-62.8'. r = 6.977707006 Simplifying r = 6.977707006
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