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Simplifying 2(2r + 1) = 15 Reorder the terms: 2(1 + 2r) = 15 (1 * 2 + 2r * 2) = 15 (2 + 4r) = 15 Solving 2 + 4r = 15 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + 4r = 15 + -2 Combine like terms: 2 + -2 = 0 0 + 4r = 15 + -2 4r = 15 + -2 Combine like terms: 15 + -2 = 13 4r = 13 Divide each side by '4'. r = 3.25 Simplifying r = 3.25
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