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Simplifying (2 * 3.14r * 6.6) + (2 * 3.14 * 16) = 0 Reorder the terms for easier multiplication: (2 * 3.14 * 6.6r) + (2 * 3.14 * 16) = 0 Multiply 2 * 3.14 (6.28 * 6.6r) + (2 * 3.14 * 16) = 0 Multiply 6.28 * 6.6 (41.448r) + (2 * 3.14 * 16) = 0 Multiply 2 * 3.14 (41.448r) + (6.28 * 16) = 0 Multiply 6.28 * 16 (41.448r) + (100.48) = 0 (41.448r) + 100.48 = 0 Reorder the terms: 100.48 + (41.448r) = 0 Solving 100.48 + (41.448r) = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-100.48' to each side of the equation. 100.48 + -100.48 + (41.448r) = 0 + -100.48 Combine like terms: 100.48 + -100.48 = 0.00 0.00 + (41.448r) = 0 + -100.48 (41.448r) = 0 + -100.48 Combine like terms: 0 + -100.48 = -100.48 (41.448r) = -100.48 Divide each side by '41.448'. r = -2.424242424 Simplifying r = -2.424242424
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