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Simplifying X + X + 1 = 243 Reorder the terms: 1 + X + X = 243 Combine like terms: X + X = 2X 1 + 2X = 243 Solving 1 + 2X = 243 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 2X = 243 + -1 Combine like terms: 1 + -1 = 0 0 + 2X = 243 + -1 2X = 243 + -1 Combine like terms: 243 + -1 = 242 2X = 242 Divide each side by '2'. X = 121 Simplifying X = 121
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