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Simplifying X + 20 = 21 Reorder the terms: 20 + X = 21 Solving 20 + X = 21 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + X = 21 + -20 Combine like terms: 20 + -20 = 0 0 + X = 21 + -20 X = 21 + -20 Combine like terms: 21 + -20 = 1 X = 1 Simplifying X = 1
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