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Simplifying r2 + 81 = 0 Reorder the terms: 81 + r2 = 0 Solving 81 + r2 = 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 + r2 = 0 + -81 Combine like terms: 81 + -81 = 0 0 + r2 = 0 + -81 r2 = 0 + -81 Combine like terms: 0 + -81 = -81 r2 = -81 Simplifying r2 = -81 Reorder the terms: 81 + r2 = -81 + 81 Combine like terms: -81 + 81 = 0 81 + r2 = 0 The solution to this equation could not be determined.
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