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Simplifying X + 21 = 43 Reorder the terms: 21 + X = 43 Solving 21 + X = 43 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + X = 43 + -21 Combine like terms: 21 + -21 = 0 0 + X = 43 + -21 X = 43 + -21 Combine like terms: 43 + -21 = 22 X = 22 Simplifying X = 22
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