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Simplifying x + (x + 42) = 138 Reorder the terms: x + (42 + x) = 138 Remove parenthesis around (42 + x) x + 42 + x = 138 Reorder the terms: 42 + x + x = 138 Combine like terms: x + x = 2x 42 + 2x = 138 Solving 42 + 2x = 138 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-42' to each side of the equation. 42 + -42 + 2x = 138 + -42 Combine like terms: 42 + -42 = 0 0 + 2x = 138 + -42 2x = 138 + -42 Combine like terms: 138 + -42 = 96 2x = 96 Divide each side by '2'. x = 48 Simplifying x = 48
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