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Simplifying X + (X + 21) = 169 Reorder the terms: X + (21 + X) = 169 Remove parenthesis around (21 + X) X + 21 + X = 169 Reorder the terms: 21 + X + X = 169 Combine like terms: X + X = 2X 21 + 2X = 169 Solving 21 + 2X = 169 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 + 2X = 169 + -21 Combine like terms: 21 + -21 = 0 0 + 2X = 169 + -21 2X = 169 + -21 Combine like terms: 169 + -21 = 148 2X = 148 Divide each side by '2'. X = 74 Simplifying X = 74
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