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Simplifying 15 = 2(3.14159265) * r Multiply 2 * 3.14159265 15 = 6.2831853r Solving 15 = 6.2831853r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-6.2831853r' to each side of the equation. 15 + -6.2831853r = 6.2831853r + -6.2831853r Combine like terms: 6.2831853r + -6.2831853r = 0.0000000 15 + -6.2831853r = 0.0000000 Add '-15' to each side of the equation. 15 + -15 + -6.2831853r = 0.0000000 + -15 Combine like terms: 15 + -15 = 0 0 + -6.2831853r = 0.0000000 + -15 -6.2831853r = 0.0000000 + -15 Combine like terms: 0.0000000 + -15 = -15 -6.2831853r = -15 Divide each side by '-6.2831853'. r = 2.387324149 Simplifying r = 2.387324149
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