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Simplifying r + 11 + 8r = 20 Reorder the terms: 11 + r + 8r = 20 Combine like terms: r + 8r = 9r 11 + 9r = 20 Solving 11 + 9r = 20 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 = 20 + -11 Combine like terms: 11 + -11 = 0 0 + 9r = 20 + -11 9r = 20 + -11 Combine like terms: 20 + -11 = 9 9r = 9 Divide each side by '9'. r = 1 Simplifying r = 1
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