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Simplifying -21 + k = k + -2k Combine like terms: k + -2k = -1k -21 + k = -1k Solving -21 + k = -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 + k = -1k + k Combine like terms: k + k = 2k -21 + 2k = -1k + k Combine like terms: -1k + k = 0 -21 + 2k = 0 Add '21' to each side of the equation. -21 + 21 + 2k = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 2k = 0 + 21 2k = 0 + 21 Combine like terms: 0 + 21 = 21 2k = 21 Divide each side by '2'. k = 10.5 Simplifying k = 10.5
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