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Simplifying 21 = -1n + 4 Reorder the terms: 21 = 4 + -1n Solving 21 = 4 + -1n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add 'n' to each side of the equation. 21 + n = 4 + -1n + n Combine like terms: -1n + n = 0 21 + n = 4 + 0 21 + n = 4 Add '-21' to each side of the equation. 21 + -21 + n = 4 + -21 Combine like terms: 21 + -21 = 0 0 + n = 4 + -21 n = 4 + -21 Combine like terms: 4 + -21 = -17 n = -17 Simplifying n = -17
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