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Simplifying 28 * 3.14159 = 2r Multiply 28 * 3.14159 87.96452 = 2r Solving 87.96452 = 2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2r' to each side of the equation. 87.96452 + -2r = 2r + -2r Combine like terms: 2r + -2r = 0 87.96452 + -2r = 0 Add '-87.96452' to each side of the equation. 87.96452 + -87.96452 + -2r = 0 + -87.96452 Combine like terms: 87.96452 + -87.96452 = 0.00000 0.00000 + -2r = 0 + -87.96452 -2r = 0 + -87.96452 Combine like terms: 0 + -87.96452 = -87.96452 -2r = -87.96452 Divide each side by '-2'. r = 43.98226 Simplifying r = 43.98226
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