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