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Simplifying 8 + 2r + 9 = 0 Reorder the terms: 8 + 9 + 2r = 0 Combine like terms: 8 + 9 = 17 17 + 2r = 0 Solving 17 + 2r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-17' to each side of the equation. 17 + -17 + 2r = 0 + -17 Combine like terms: 17 + -17 = 0 0 + 2r = 0 + -17 2r = 0 + -17 Combine like terms: 0 + -17 = -17 2r = -17 Divide each side by '2'. r = -8.5 Simplifying r = -8.5
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