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Simplifying x + 21 = 102 Reorder the terms: 21 + x = 102 Solving 21 + x = 102 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 = 102 + -21 Combine like terms: 21 + -21 = 0 0 + x = 102 + -21 x = 102 + -21 Combine like terms: 102 + -21 = 81 x = 81 Simplifying x = 81
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