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Simplifying 144 * 3.14 = 2 * 3.14r Multiply 144 * 3.14 452.16 = 2 * 3.14r Multiply 2 * 3.14 452.16 = 6.28r Solving 452.16 = 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. 452.16 + -6.28r = 6.28r + -6.28r Combine like terms: 6.28r + -6.28r = 0.00 452.16 + -6.28r = 0.00 Add '-452.16' to each side of the equation. 452.16 + -452.16 + -6.28r = 0.00 + -452.16 Combine like terms: 452.16 + -452.16 = 0.00 0.00 + -6.28r = 0.00 + -452.16 -6.28r = 0.00 + -452.16 Combine like terms: 0.00 + -452.16 = -452.16 -6.28r = -452.16 Divide each side by '-6.28'. r = 72 Simplifying r = 72
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