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Simplifying (8 + 7r) + (8 + r) = 0 Remove parenthesis around (8 + 7r) 8 + 7r + (8 + r) = 0 Remove parenthesis around (8 + r) 8 + 7r + 8 + r = 0 Reorder the terms: 8 + 8 + 7r + r = 0 Combine like terms: 8 + 8 = 16 16 + 7r + r = 0 Combine like terms: 7r + r = 8r 16 + 8r = 0 Solving 16 + 8r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-16' to each side of the equation. 16 + -16 + 8r = 0 + -16 Combine like terms: 16 + -16 = 0 0 + 8r = 0 + -16 8r = 0 + -16 Combine like terms: 0 + -16 = -16 8r = -16 Divide each side by '8'. r = -2 Simplifying r = -2
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