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