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