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Simplifying r + 11 + 8r = 28 Reorder the terms: 11 + r + 8r = 28 Combine like terms: r + 8r = 9r 11 + 9r = 28 Solving 11 + 9r = 28 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-11' to each side of the equation. 11 + -11 + 9r = 28 + -11 Combine like terms: 11 + -11 = 0 0 + 9r = 28 + -11 9r = 28 + -11 Combine like terms: 28 + -11 = 17 9r = 17 Divide each side by '9'. r = 1.888888889 Simplifying r = 1.888888889
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