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Simplifying 72.2 = 2(3.14) * r Multiply 2 * 3.14 72.2 = 6.28r Solving 72.2 = 6.28r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-6.28r' to each side of the equation. 72.2 + -6.28r = 6.28r + -6.28r Combine like terms: 6.28r + -6.28r = 0.00 72.2 + -6.28r = 0.00 Add '-72.2' to each side of the equation. 72.2 + -72.2 + -6.28r = 0.00 + -72.2 Combine like terms: 72.2 + -72.2 = 0.0 0.0 + -6.28r = 0.00 + -72.2 -6.28r = 0.00 + -72.2 Combine like terms: 0.00 + -72.2 = -72.2 -6.28r = -72.2 Divide each side by '-6.28'. r = 11.49681529 Simplifying r = 11.49681529
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