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Simplifying 7(r + 3) + 8r = 0 Reorder the terms: 7(3 + r) + 8r = 0 (3 * 7 + r * 7) + 8r = 0 (21 + 7r) + 8r = 0 Combine like terms: 7r + 8r = 15r 21 + 15r = 0 Solving 21 + 15r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 15r = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 15r = 0 + -21 15r = 0 + -21 Combine like terms: 0 + -21 = -21 15r = -21 Divide each side by '15'. r = -1.4 Simplifying r = -1.4
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