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Simplifying r + 9 + 10r + -5 + -4r = 0 Reorder the terms: 9 + -5 + r + 10r + -4r = 0 Combine like terms: 9 + -5 = 4 4 + r + 10r + -4r = 0 Combine like terms: r + 10r = 11r 4 + 11r + -4r = 0 Combine like terms: 11r + -4r = 7r 4 + 7r = 0 Solving 4 + 7r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 7r = 0 + -4 Combine like terms: 4 + -4 = 0 0 + 7r = 0 + -4 7r = 0 + -4 Combine like terms: 0 + -4 = -4 7r = -4 Divide each side by '7'. r = -0.5714285714 Simplifying r = -0.5714285714
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