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Simplifying 4x + 12 + 3x + 9 = 0 Reorder the terms: 12 + 9 + 4x + 3x = 0 Combine like terms: 12 + 9 = 21 21 + 4x + 3x = 0 Combine like terms: 4x + 3x = 7x 21 + 7x = 0 Solving 21 + 7x = 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 + 7x = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 7x = 0 + -21 7x = 0 + -21 Combine like terms: 0 + -21 = -21 7x = -21 Divide each side by '7'. x = -3 Simplifying x = -3
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