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Simplifying 25 = 2(3.14) * r Multiply 2 * 3.14 25 = 6.28r Solving 25 = 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. 25 + -6.28r = 6.28r + -6.28r Combine like terms: 6.28r + -6.28r = 0.00 25 + -6.28r = 0.00 Add '-25' to each side of the equation. 25 + -25 + -6.28r = 0.00 + -25 Combine like terms: 25 + -25 = 0 0 + -6.28r = 0.00 + -25 -6.28r = 0.00 + -25 Combine like terms: 0.00 + -25 = -25 -6.28r = -25 Divide each side by '-6.28'. r = 3.98089172 Simplifying r = 3.98089172
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