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Simplifying 7.21 = 2 * 3.14r Multiply 2 * 3.14 7.21 = 6.28r Solving 7.21 = 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. 7.21 + -6.28r = 6.28r + -6.28r Combine like terms: 6.28r + -6.28r = 0.00 7.21 + -6.28r = 0.00 Add '-7.21' to each side of the equation. 7.21 + -7.21 + -6.28r = 0.00 + -7.21 Combine like terms: 7.21 + -7.21 = 0.00 0.00 + -6.28r = 0.00 + -7.21 -6.28r = 0.00 + -7.21 Combine like terms: 0.00 + -7.21 = -7.21 -6.28r = -7.21 Divide each side by '-6.28'. r = 1.148089172 Simplifying r = 1.148089172
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