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Simplifying (x + 12.9) + x = 723.1 Reorder the terms: (12.9 + x) + x = 723.1 Remove parenthesis around (12.9 + x) 12.9 + x + x = 723.1 Combine like terms: x + x = 2x 12.9 + 2x = 723.1 Solving 12.9 + 2x = 723.1 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12.9' to each side of the equation. 12.9 + -12.9 + 2x = 723.1 + -12.9 Combine like terms: 12.9 + -12.9 = 0.0 0.0 + 2x = 723.1 + -12.9 2x = 723.1 + -12.9 Combine like terms: 723.1 + -12.9 = 710.2 2x = 710.2 Divide each side by '2'. x = 355.1 Simplifying x = 355.1
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