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Simplifying (x + 9) + (x + 11) = 0 Reorder the terms: (9 + x) + (x + 11) = 0 Remove parenthesis around (9 + x) 9 + x + (x + 11) = 0 Reorder the terms: 9 + x + (11 + x) = 0 Remove parenthesis around (11 + x) 9 + x + 11 + x = 0 Reorder the terms: 9 + 11 + x + x = 0 Combine like terms: 9 + 11 = 20 20 + x + x = 0 Combine like terms: x + x = 2x 20 + 2x = 0 Solving 20 + 2x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + 2x = 0 + -20 Combine like terms: 20 + -20 = 0 0 + 2x = 0 + -20 2x = 0 + -20 Combine like terms: 0 + -20 = -20 2x = -20 Divide each side by '2'. x = -10 Simplifying x = -10
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