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Simplifying x + (x + 4) = 12 Reorder the terms: x + (4 + x) = 12 Remove parenthesis around (4 + x) x + 4 + x = 12 Reorder the terms: 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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