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Simplifying 4n + 21 + -2n + 21 = -4 Reorder the terms: 21 + 21 + 4n + -2n = -4 Combine like terms: 21 + 21 = 42 42 + 4n + -2n = -4 Combine like terms: 4n + -2n = 2n 42 + 2n = -4 Solving 42 + 2n = -4 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-42' to each side of the equation. 42 + -42 + 2n = -4 + -42 Combine like terms: 42 + -42 = 0 0 + 2n = -4 + -42 2n = -4 + -42 Combine like terms: -4 + -42 = -46 2n = -46 Divide each side by '2'. n = -23 Simplifying n = -23
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