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Simplifying 4r + 8 + 5r = 0 Reorder the terms: 8 + 4r + 5r = 0 Combine like terms: 4r + 5r = 9r 8 + 9r = 0 Solving 8 + 9r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + 9r = 0 + -8 Combine like terms: 8 + -8 = 0 0 + 9r = 0 + -8 9r = 0 + -8 Combine like terms: 0 + -8 = -8 9r = -8 Divide each side by '9'. r = -0.8888888889 Simplifying r = -0.8888888889
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