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Simplifying 47.1 = 2 * 3.14r Multiply 2 * 3.14 47.1 = 6.28r Solving 47.1 = 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. 47.1 + -6.28r = 6.28r + -6.28r Combine like terms: 6.28r + -6.28r = 0.00 47.1 + -6.28r = 0.00 Add '-47.1' to each side of the equation. 47.1 + -47.1 + -6.28r = 0.00 + -47.1 Combine like terms: 47.1 + -47.1 = 0.0 0.0 + -6.28r = 0.00 + -47.1 -6.28r = 0.00 + -47.1 Combine like terms: 0.00 + -47.1 = -47.1 -6.28r = -47.1 Divide each side by '-6.28'. r = 7.5 Simplifying r = 7.5
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