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Simplifying (20 + -1n) + n + (18 + -1n) = 25 Remove parenthesis around (20 + -1n) 20 + -1n + n + (18 + -1n) = 25 Remove parenthesis around (18 + -1n) 20 + -1n + n + 18 + -1n = 25 Reorder the terms: 20 + 18 + -1n + n + -1n = 25 Combine like terms: 20 + 18 = 38 38 + -1n + n + -1n = 25 Combine like terms: -1n + n = 0 38 + 0 + -1n = 25 38 + -1n = 25 Solving 38 + -1n = 25 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-38' to each side of the equation. 38 + -38 + -1n = 25 + -38 Combine like terms: 38 + -38 = 0 0 + -1n = 25 + -38 -1n = 25 + -38 Combine like terms: 25 + -38 = -13 -1n = -13 Divide each side by '-1'. n = 13 Simplifying n = 13
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