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Simplifying -21 = -9 + -1n Solving -21 = -9 + -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 = -9 + -1n + n Combine like terms: -1n + n = 0 -21 + n = -9 + 0 -21 + n = -9 Add '21' to each side of the equation. -21 + 21 + n = -9 + 21 Combine like terms: -21 + 21 = 0 0 + n = -9 + 21 n = -9 + 21 Combine like terms: -9 + 21 = 12 n = 12 Simplifying n = 12
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