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Simplifying 21 = -2 + -1k Solving 21 = -2 + -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 = -2 + -1k + k Combine like terms: -1k + k = 0 21 + k = -2 + 0 21 + k = -2 Add '-21' to each side of the equation. 21 + -21 + k = -2 + -21 Combine like terms: 21 + -21 = 0 0 + k = -2 + -21 k = -2 + -21 Combine like terms: -2 + -21 = -23 k = -23 Simplifying k = -23
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