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Simplifying 9n + -7n + -1 = 13 Reorder the terms: -1 + 9n + -7n = 13 Combine like terms: 9n + -7n = 2n -1 + 2n = 13 Solving -1 + 2n = 13 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 2n = 13 + 1 Combine like terms: -1 + 1 = 0 0 + 2n = 13 + 1 2n = 13 + 1 Combine like terms: 13 + 1 = 14 2n = 14 Divide each side by '2'. n = 7 Simplifying n = 7
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