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Simplifying -21 = -1n + -9 + -6 Reorder the terms: -21 = -9 + -6 + -1n Combine like terms: -9 + -6 = -15 -21 = -15 + -1n Solving -21 = -15 + -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 = -15 + -1n + n Combine like terms: -1n + n = 0 -21 + n = -15 + 0 -21 + n = -15 Add '21' to each side of the equation. -21 + 21 + n = -15 + 21 Combine like terms: -21 + 21 = 0 0 + n = -15 + 21 n = -15 + 21 Combine like terms: -15 + 21 = 6 n = 6 Simplifying n = 6
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