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Simplifying 9r + -81 = 0 Reorder the terms: -81 + 9r = 0 Solving -81 + 9r = 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 + 9r = 0 + 81 Combine like terms: -81 + 81 = 0 0 + 9r = 0 + 81 9r = 0 + 81 Combine like terms: 0 + 81 = 81 9r = 81 Divide each side by '9'. r = 9 Simplifying r = 9
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