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Simplifying 8(r + 9) + 7r = 0 Reorder the terms: 8(9 + r) + 7r = 0 (9 * 8 + r * 8) + 7r = 0 (72 + 8r) + 7r = 0 Combine like terms: 8r + 7r = 15r 72 + 15r = 0 Solving 72 + 15r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-72' to each side of the equation. 72 + -72 + 15r = 0 + -72 Combine like terms: 72 + -72 = 0 0 + 15r = 0 + -72 15r = 0 + -72 Combine like terms: 0 + -72 = -72 15r = -72 Divide each side by '15'. r = -4.8 Simplifying r = -4.8
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