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Simplifying n + n + -21 = 17 Reorder the terms: -21 + n + n = 17 Combine like terms: n + n = 2n -21 + 2n = 17 Solving -21 + 2n = 17 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 2n = 17 + 21 Combine like terms: -21 + 21 = 0 0 + 2n = 17 + 21 2n = 17 + 21 Combine like terms: 17 + 21 = 38 2n = 38 Divide each side by '2'. n = 19 Simplifying n = 19
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