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Simplifying x + -12 = -21 Reorder the terms: -12 + x = -21 Solving -12 + x = -21 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 = -21 + 12 Combine like terms: -12 + 12 = 0 0 + x = -21 + 12 x = -21 + 12 Combine like terms: -21 + 12 = -9 x = -9 Simplifying x = -9
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