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Simplifying (r + 7)(7 + 7) = 0 Reorder the terms: (7 + r)(7 + 7) = 0 Combine like terms: 7 + 7 = 14 (7 + r)(14) = 0 Reorder the terms for easier multiplication: 14(7 + r) = 0 (7 * 14 + r * 14) = 0 (98 + 14r) = 0 Solving 98 + 14r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-98' to each side of the equation. 98 + -98 + 14r = 0 + -98 Combine like terms: 98 + -98 = 0 0 + 14r = 0 + -98 14r = 0 + -98 Combine like terms: 0 + -98 = -98 14r = -98 Divide each side by '14'. r = -7 Simplifying r = -7
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