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Simplifying (X + 4) + X = 12 Reorder the terms: (4 + X) + X = 12 Remove parenthesis around (4 + X) 4 + X + X = 12 Combine like terms: X + X = 2X 4 + 2X = 12 Solving 4 + 2X = 12 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 = 12 + -4 Combine like terms: 4 + -4 = 0 0 + 2X = 12 + -4 2X = 12 + -4 Combine like terms: 12 + -4 = 8 2X = 8 Divide each side by '2'. X = 4 Simplifying X = 4
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