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Simplifying 1 + 8r + 5r + 7 = 0 Reorder the terms: 1 + 7 + 8r + 5r = 0 Combine like terms: 1 + 7 = 8 8 + 8r + 5r = 0 Combine like terms: 8r + 5r = 13r 8 + 13r = 0 Solving 8 + 13r = 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 + 13r = 0 + -8 Combine like terms: 8 + -8 = 0 0 + 13r = 0 + -8 13r = 0 + -8 Combine like terms: 0 + -8 = -8 13r = -8 Divide each side by '13'. r = -0.6153846154 Simplifying r = -0.6153846154
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