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Simplifying r + 3 = 2(e + 3) + 13 Reorder the terms: 3 + r = 2(e + 3) + 13 Reorder the terms: 3 + r = 2(3 + e) + 13 3 + r = (3 * 2 + e * 2) + 13 3 + r = (6 + 2e) + 13 Reorder the terms: 3 + r = 6 + 13 + 2e Combine like terms: 6 + 13 = 19 3 + r = 19 + 2e Solving 3 + r = 19 + 2e 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 + r = 19 + -3 + 2e Combine like terms: 3 + -3 = 0 0 + r = 19 + -3 + 2e r = 19 + -3 + 2e Combine like terms: 19 + -3 = 16 r = 16 + 2e Simplifying r = 16 + 2e
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