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