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Simplifying (x + 3) + 9 = 12 Reorder the terms: (3 + x) + 9 = 12 Remove parenthesis around (3 + x) 3 + x + 9 = 12 Reorder the terms: 3 + 9 + x = 12 Combine like terms: 3 + 9 = 12 12 + x = 12 Add '-12' to each side of the equation. 12 + -12 + x = 12 + -12 Combine like terms: 12 + -12 = 0 0 + x = 12 + -12 x = 12 + -12 Combine like terms: 12 + -12 = 0 x = 0 Solving x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Simplifying x = 0
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