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Simplifying 12 + -3x + 9 = -4x Reorder the terms: 12 + 9 + -3x = -4x Combine like terms: 12 + 9 = 21 21 + -3x = -4x Solving 21 + -3x = -4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4x' to each side of the equation. 21 + -3x + 4x = -4x + 4x Combine like terms: -3x + 4x = 1x 21 + 1x = -4x + 4x Combine like terms: -4x + 4x = 0 21 + 1x = 0 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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