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Simplifying (n + 7) + (n + 3) + (n + 3) + n = 40 Reorder the terms: (7 + n) + (n + 3) + (n + 3) + n = 40 Remove parenthesis around (7 + n) 7 + n + (n + 3) + (n + 3) + n = 40 Reorder the terms: 7 + n + (3 + n) + (n + 3) + n = 40 Remove parenthesis around (3 + n) 7 + n + 3 + n + (n + 3) + n = 40 Reorder the terms: 7 + n + 3 + n + (3 + n) + n = 40 Remove parenthesis around (3 + n) 7 + n + 3 + n + 3 + n + n = 40 Reorder the terms: 7 + 3 + 3 + n + n + n + n = 40 Combine like terms: 7 + 3 = 10 10 + 3 + n + n + n + n = 40 Combine like terms: 10 + 3 = 13 13 + n + n + n + n = 40 Combine like terms: n + n = 2n 13 + 2n + n + n = 40 Combine like terms: 2n + n = 3n 13 + 3n + n = 40 Combine like terms: 3n + n = 4n 13 + 4n = 40 Solving 13 + 4n = 40 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + 4n = 40 + -13 Combine like terms: 13 + -13 = 0 0 + 4n = 40 + -13 4n = 40 + -13 Combine like terms: 40 + -13 = 27 4n = 27 Divide each side by '4'. n = 6.75 Simplifying n = 6.75
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