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Simplifying 2(20 + r + r) = 300 Combine like terms: r + r = 2r 2(20 + 2r) = 300 (20 * 2 + 2r * 2) = 300 (40 + 4r) = 300 Solving 40 + 4r = 300 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-40' to each side of the equation. 40 + -40 + 4r = 300 + -40 Combine like terms: 40 + -40 = 0 0 + 4r = 300 + -40 4r = 300 + -40 Combine like terms: 300 + -40 = 260 4r = 260 Divide each side by '4'. r = 65 Simplifying r = 65
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