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Simplifying x + (1 + x) = 21 Remove parenthesis around (1 + x) x + 1 + x = 21 Reorder the terms: 1 + x + x = 21 Combine like terms: x + x = 2x 1 + 2x = 21 Solving 1 + 2x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 2x = 21 + -1 Combine like terms: 1 + -1 = 0 0 + 2x = 21 + -1 2x = 21 + -1 Combine like terms: 21 + -1 = 20 2x = 20 Divide each side by '2'. x = 10 Simplifying x = 10
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