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Simplifying 3r + -8 + 4r + 9 = 0 Reorder the terms: -8 + 9 + 3r + 4r = 0 Combine like terms: -8 + 9 = 1 1 + 3r + 4r = 0 Combine like terms: 3r + 4r = 7r 1 + 7r = 0 Solving 1 + 7r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 7r = 0 + -1 Combine like terms: 1 + -1 = 0 0 + 7r = 0 + -1 7r = 0 + -1 Combine like terms: 0 + -1 = -1 7r = -1 Divide each side by '7'. r = -0.1428571429 Simplifying r = -0.1428571429
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