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Simplifying 140 * 3.14 = 2 * 3.14r * 10 Multiply 140 * 3.14 439.6 = 2 * 3.14r * 10 Reorder the terms for easier multiplication: 439.6 = 2 * 3.14 * 10r Multiply 2 * 3.14 439.6 = 6.28 * 10r Multiply 6.28 * 10 439.6 = 62.8r Solving 439.6 = 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. 439.6 + -62.8r = 62.8r + -62.8r Combine like terms: 62.8r + -62.8r = 0.0 439.6 + -62.8r = 0.0 Add '-439.6' to each side of the equation. 439.6 + -439.6 + -62.8r = 0.0 + -439.6 Combine like terms: 439.6 + -439.6 = 0.0 0.0 + -62.8r = 0.0 + -439.6 -62.8r = 0.0 + -439.6 Combine like terms: 0.0 + -439.6 = -439.6 -62.8r = -439.6 Divide each side by '-62.8'. r = 7 Simplifying r = 7
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