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Simplifying 21 = k + 28 Reorder the terms: 21 = 28 + k Solving 21 = 28 + 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 = 28 + k + -1k Combine like terms: k + -1k = 0 21 + -1k = 28 + 0 21 + -1k = 28 Add '-21' to each side of the equation. 21 + -21 + -1k = 28 + -21 Combine like terms: 21 + -21 = 0 0 + -1k = 28 + -21 -1k = 28 + -21 Combine like terms: 28 + -21 = 7 -1k = 7 Divide each side by '-1'. k = -7 Simplifying k = -7
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