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Simplifying 2x + 9 + -1x + 12 = 0 Reorder the terms: 9 + 12 + 2x + -1x = 0 Combine like terms: 9 + 12 = 21 21 + 2x + -1x = 0 Combine like terms: 2x + -1x = 1x 21 + 1x = 0 Solving 21 + 1x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 1x = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 1x = 0 + -21 1x = 0 + -21 Combine like terms: 0 + -21 = -21 1x = -21 Divide each side by '1'. x = -21 Simplifying x = -21
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