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Simplifying 2(r + 4) + -5 = 13 Reorder the terms: 2(4 + r) + -5 = 13 (4 * 2 + r * 2) + -5 = 13 (8 + 2r) + -5 = 13 Reorder the terms: 8 + -5 + 2r = 13 Combine like terms: 8 + -5 = 3 3 + 2r = 13 Solving 3 + 2r = 13 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 = 13 + -3 Combine like terms: 3 + -3 = 0 0 + 2r = 13 + -3 2r = 13 + -3 Combine like terms: 13 + -3 = 10 2r = 10 Divide each side by '2'. r = 5 Simplifying r = 5
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