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Simplifying 13 = 2 * 3.14r Multiply 2 * 3.14 13 = 6.28r Solving 13 = 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. 13 + -6.28r = 6.28r + -6.28r Combine like terms: 6.28r + -6.28r = 0.00 13 + -6.28r = 0.00 Add '-13' to each side of the equation. 13 + -13 + -6.28r = 0.00 + -13 Combine like terms: 13 + -13 = 0 0 + -6.28r = 0.00 + -13 -6.28r = 0.00 + -13 Combine like terms: 0.00 + -13 = -13 -6.28r = -13 Divide each side by '-6.28'. r = 2.070063694 Simplifying r = 2.070063694
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