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Simplifying -9 + 7(r + 10) = 0 Reorder the terms: -9 + 7(10 + r) = 0 -9 + (10 * 7 + r * 7) = 0 -9 + (70 + 7r) = 0 Combine like terms: -9 + 70 = 61 61 + 7r = 0 Solving 61 + 7r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-61' to each side of the equation. 61 + -61 + 7r = 0 + -61 Combine like terms: 61 + -61 = 0 0 + 7r = 0 + -61 7r = 0 + -61 Combine like terms: 0 + -61 = -61 7r = -61 Divide each side by '7'. r = -8.714285714 Simplifying r = -8.714285714
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