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Simplifying x + (15 + x) = 121 Remove parenthesis around (15 + x) x + 15 + x = 121 Reorder the terms: 15 + x + x = 121 Combine like terms: x + x = 2x 15 + 2x = 121 Solving 15 + 2x = 121 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + 2x = 121 + -15 Combine like terms: 15 + -15 = 0 0 + 2x = 121 + -15 2x = 121 + -15 Combine like terms: 121 + -15 = 106 2x = 106 Divide each side by '2'. x = 53 Simplifying x = 53
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