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Simplifying 21x = 3x Solving 21x = 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. 21x + -3x = 3x + -3x Combine like terms: 21x + -3x = 18x 18x = 3x + -3x Combine like terms: 3x + -3x = 0 18x = 0 Divide each side by '18'. x = 0 Simplifying x = 0
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