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Simplifying 0.7(r + 9) = 0 Reorder the terms: 0.7(9 + r) = 0 (9 * 0.7 + r * 0.7) = 0 (6.3 + 0.7r) = 0 Solving 6.3 + 0.7r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-6.3' to each side of the equation. 6.3 + -6.3 + 0.7r = 0 + -6.3 Combine like terms: 6.3 + -6.3 = 0.0 0.0 + 0.7r = 0 + -6.3 0.7r = 0 + -6.3 Combine like terms: 0 + -6.3 = -6.3 0.7r = -6.3 Divide each side by '0.7'. r = -9 Simplifying r = -9
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