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Simplifying -21 = 9 + -1k Solving -21 = 9 + -1k Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add 'k' to each side of the equation. -21 + k = 9 + -1k + k Combine like terms: -1k + k = 0 -21 + k = 9 + 0 -21 + k = 9 Add '21' to each side of the equation. -21 + 21 + k = 9 + 21 Combine like terms: -21 + 21 = 0 0 + k = 9 + 21 k = 9 + 21 Combine like terms: 9 + 21 = 30 k = 30 Simplifying k = 30
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