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Simplifying a + -9 = 12 Reorder the terms: -9 + a = 12 Solving -9 + a = 12 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + a = 12 + 9 Combine like terms: -9 + 9 = 0 0 + a = 12 + 9 a = 12 + 9 Combine like terms: 12 + 9 = 21 a = 21 Simplifying a = 21
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