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