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Simplifying 7.72 = 2(3.14) * r Multiply 2 * 3.14 7.72 = 6.28r Solving 7.72 = 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. 7.72 + -6.28r = 6.28r + -6.28r Combine like terms: 6.28r + -6.28r = 0.00 7.72 + -6.28r = 0.00 Add '-7.72' to each side of the equation. 7.72 + -7.72 + -6.28r = 0.00 + -7.72 Combine like terms: 7.72 + -7.72 = 0.00 0.00 + -6.28r = 0.00 + -7.72 -6.28r = 0.00 + -7.72 Combine like terms: 0.00 + -7.72 = -7.72 -6.28r = -7.72 Divide each side by '-6.28'. r = 1.229299363 Simplifying r = 1.229299363
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