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Simplifying 8.164 = 2 * 3.14r Multiply 2 * 3.14 8.164 = 6.28r Solving 8.164 = 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. 8.164 + -6.28r = 6.28r + -6.28r Combine like terms: 6.28r + -6.28r = 0.00 8.164 + -6.28r = 0.00 Add '-8.164' to each side of the equation. 8.164 + -8.164 + -6.28r = 0.00 + -8.164 Combine like terms: 8.164 + -8.164 = 0.000 0.000 + -6.28r = 0.00 + -8.164 -6.28r = 0.00 + -8.164 Combine like terms: 0.00 + -8.164 = -8.164 -6.28r = -8.164 Divide each side by '-6.28'. r = 1.3 Simplifying r = 1.3
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