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Simplifying 18 = 2 * 3.14r Multiply 2 * 3.14 18 = 6.28r Solving 18 = 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. 18 + -6.28r = 6.28r + -6.28r Combine like terms: 6.28r + -6.28r = 0.00 18 + -6.28r = 0.00 Add '-18' to each side of the equation. 18 + -18 + -6.28r = 0.00 + -18 Combine like terms: 18 + -18 = 0 0 + -6.28r = 0.00 + -18 -6.28r = 0.00 + -18 Combine like terms: 0.00 + -18 = -18 -6.28r = -18 Divide each side by '-6.28'. r = 2.866242038 Simplifying r = 2.866242038
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