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Simplifying 1909 = 2 * 3.14r * 30 Reorder the terms for easier multiplication: 1909 = 2 * 3.14 * 30r Multiply 2 * 3.14 1909 = 6.28 * 30r Multiply 6.28 * 30 1909 = 188.4r Solving 1909 = 188.4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-188.4r' to each side of the equation. 1909 + -188.4r = 188.4r + -188.4r Combine like terms: 188.4r + -188.4r = 0.0 1909 + -188.4r = 0.0 Add '-1909' to each side of the equation. 1909 + -1909 + -188.4r = 0.0 + -1909 Combine like terms: 1909 + -1909 = 0 0 + -188.4r = 0.0 + -1909 -188.4r = 0.0 + -1909 Combine like terms: 0.0 + -1909 = -1909 -188.4r = -1909 Divide each side by '-188.4'. r = 10.13269639 Simplifying r = 10.13269639
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