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Simplifying x + (x + 40) = 126 Reorder the terms: x + (40 + x) = 126 Remove parenthesis around (40 + x) x + 40 + x = 126 Reorder the terms: 40 + x + x = 126 Combine like terms: x + x = 2x 40 + 2x = 126 Solving 40 + 2x = 126 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-40' to each side of the equation. 40 + -40 + 2x = 126 + -40 Combine like terms: 40 + -40 = 0 0 + 2x = 126 + -40 2x = 126 + -40 Combine like terms: 126 + -40 = 86 2x = 86 Divide each side by '2'. x = 43 Simplifying x = 43
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