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Simplifying 9 + 12x + 3x + 12 = 126 Reorder the terms: 9 + 12 + 12x + 3x = 126 Combine like terms: 9 + 12 = 21 21 + 12x + 3x = 126 Combine like terms: 12x + 3x = 15x 21 + 15x = 126 Solving 21 + 15x = 126 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 + 15x = 126 + -21 Combine like terms: 21 + -21 = 0 0 + 15x = 126 + -21 15x = 126 + -21 Combine like terms: 126 + -21 = 105 15x = 105 Divide each side by '15'. x = 7 Simplifying x = 7
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