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Simplifying (a + 12) + -9 = 4 Reorder the terms: (12 + a) + -9 = 4 Remove parenthesis around (12 + a) 12 + a + -9 = 4 Reorder the terms: 12 + -9 + a = 4 Combine like terms: 12 + -9 = 3 3 + a = 4 Solving 3 + a = 4 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + a = 4 + -3 Combine like terms: 3 + -3 = 0 0 + a = 4 + -3 a = 4 + -3 Combine like terms: 4 + -3 = 1 a = 1 Simplifying a = 1
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