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Simplifying r + 11 + 8r = 89 Reorder the terms: 11 + r + 8r = 89 Combine like terms: r + 8r = 9r 11 + 9r = 89 Solving 11 + 9r = 89 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 = 89 + -11 Combine like terms: 11 + -11 = 0 0 + 9r = 89 + -11 9r = 89 + -11 Combine like terms: 89 + -11 = 78 9r = 78 Divide each side by '9'. r = 8.666666667 Simplifying r = 8.666666667
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