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