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Simplifying 15.7 = 2 * 3.14r Multiply 2 * 3.14 15.7 = 6.28r Solving 15.7 = 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. 15.7 + -6.28r = 6.28r + -6.28r Combine like terms: 6.28r + -6.28r = 0.00 15.7 + -6.28r = 0.00 Add '-15.7' to each side of the equation. 15.7 + -15.7 + -6.28r = 0.00 + -15.7 Combine like terms: 15.7 + -15.7 = 0.0 0.0 + -6.28r = 0.00 + -15.7 -6.28r = 0.00 + -15.7 Combine like terms: 0.00 + -15.7 = -15.7 -6.28r = -15.7 Divide each side by '-6.28'. r = 2.5 Simplifying r = 2.5
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