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Simplifying 81.64 = 2r * 3.14 Reorder the terms for easier multiplication: 81.64 = 2 * 3.14r Multiply 2 * 3.14 81.64 = 6.28r Solving 81.64 = 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. 81.64 + -6.28r = 6.28r + -6.28r Combine like terms: 6.28r + -6.28r = 0.00 81.64 + -6.28r = 0.00 Add '-81.64' to each side of the equation. 81.64 + -81.64 + -6.28r = 0.00 + -81.64 Combine like terms: 81.64 + -81.64 = 0.00 0.00 + -6.28r = 0.00 + -81.64 -6.28r = 0.00 + -81.64 Combine like terms: 0.00 + -81.64 = -81.64 -6.28r = -81.64 Divide each side by '-6.28'. r = 13 Simplifying r = 13
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