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Simplifying 9(9 + 8r) = 0 (9 * 9 + 8r * 9) = 0 (81 + 72r) = 0 Solving 81 + 72r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-81' to each side of the equation. 81 + -81 + 72r = 0 + -81 Combine like terms: 81 + -81 = 0 0 + 72r = 0 + -81 72r = 0 + -81 Combine like terms: 0 + -81 = -81 72r = -81 Divide each side by '72'. r = -1.125 Simplifying r = -1.125
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