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Simplifying r + (3 + r) = 15 Remove parenthesis around (3 + r) r + 3 + r = 15 Reorder the terms: 3 + r + r = 15 Combine like terms: r + r = 2r 3 + 2r = 15 Solving 3 + 2r = 15 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 2r = 15 + -3 Combine like terms: 3 + -3 = 0 0 + 2r = 15 + -3 2r = 15 + -3 Combine like terms: 15 + -3 = 12 2r = 12 Divide each side by '2'. r = 6 Simplifying r = 6
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