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Simplifying k + 4 = 21 Reorder the terms: 4 + k = 21 Solving 4 + k = 21 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + k = 21 + -4 Combine like terms: 4 + -4 = 0 0 + k = 21 + -4 k = 21 + -4 Combine like terms: 21 + -4 = 17 k = 17 Simplifying k = 17
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