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Simplifying (n + 7) + 15 = 42 Reorder the terms: (7 + n) + 15 = 42 Remove parenthesis around (7 + n) 7 + n + 15 = 42 Reorder the terms: 7 + 15 + n = 42 Combine like terms: 7 + 15 = 22 22 + n = 42 Solving 22 + n = 42 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-22' to each side of the equation. 22 + -22 + n = 42 + -22 Combine like terms: 22 + -22 = 0 0 + n = 42 + -22 n = 42 + -22 Combine like terms: 42 + -22 = 20 n = 20 Simplifying n = 20
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