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Simplifying X + (X + 4) = 280 Reorder the terms: X + (4 + X) = 280 Remove parenthesis around (4 + X) X + 4 + X = 280 Reorder the terms: 4 + X + X = 280 Combine like terms: X + X = 2X 4 + 2X = 280 Solving 4 + 2X = 280 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 2X = 280 + -4 Combine like terms: 4 + -4 = 0 0 + 2X = 280 + -4 2X = 280 + -4 Combine like terms: 280 + -4 = 276 2X = 276 Divide each side by '2'. X = 138 Simplifying X = 138
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