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Simplifying r + 11 + 8r = 21 Reorder the terms: 11 + r + 8r = 21 Combine like terms: r + 8r = 9r 11 + 9r = 21 Solving 11 + 9r = 21 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 = 21 + -11 Combine like terms: 11 + -11 = 0 0 + 9r = 21 + -11 9r = 21 + -11 Combine like terms: 21 + -11 = 10 9r = 10 Divide each side by '9'. r = 1.111111111 Simplifying r = 1.111111111
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