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