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Simplifying 9r = 20 + r Solving 9r = 20 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. 9r + -1r = 20 + r + -1r Combine like terms: 9r + -1r = 8r 8r = 20 + r + -1r Combine like terms: r + -1r = 0 8r = 20 + 0 8r = 20 Divide each side by '8'. r = 2.5 Simplifying r = 2.5
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