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Simplifying (15 + -1n) + (12 + -1n) = 13 Remove parenthesis around (15 + -1n) 15 + -1n + (12 + -1n) = 13 Remove parenthesis around (12 + -1n) 15 + -1n + 12 + -1n = 13 Reorder the terms: 15 + 12 + -1n + -1n = 13 Combine like terms: 15 + 12 = 27 27 + -1n + -1n = 13 Combine like terms: -1n + -1n = -2n 27 + -2n = 13 Solving 27 + -2n = 13 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-27' to each side of the equation. 27 + -27 + -2n = 13 + -27 Combine like terms: 27 + -27 = 0 0 + -2n = 13 + -27 -2n = 13 + -27 Combine like terms: 13 + -27 = -14 -2n = -14 Divide each side by '-2'. n = 7 Simplifying n = 7
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