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Simplifying (x + 12.1) + x = 723.9 Reorder the terms: (12.1 + x) + x = 723.9 Remove parenthesis around (12.1 + x) 12.1 + x + x = 723.9 Combine like terms: x + x = 2x 12.1 + 2x = 723.9 Solving 12.1 + 2x = 723.9 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12.1' to each side of the equation. 12.1 + -12.1 + 2x = 723.9 + -12.1 Combine like terms: 12.1 + -12.1 = 0.0 0.0 + 2x = 723.9 + -12.1 2x = 723.9 + -12.1 Combine like terms: 723.9 + -12.1 = 711.8 2x = 711.8 Divide each side by '2'. x = 355.9 Simplifying x = 355.9
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