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Simplifying (2n + 7) + 2n = 78 Reorder the terms: (7 + 2n) + 2n = 78 Remove parenthesis around (7 + 2n) 7 + 2n + 2n = 78 Combine like terms: 2n + 2n = 4n 7 + 4n = 78 Solving 7 + 4n = 78 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 4n = 78 + -7 Combine like terms: 7 + -7 = 0 0 + 4n = 78 + -7 4n = 78 + -7 Combine like terms: 78 + -7 = 71 4n = 71 Divide each side by '4'. n = 17.75 Simplifying n = 17.75
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