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Simplifying (k + -4) = 21 Reorder the terms: (-4 + k) = 21 Remove parenthesis around (-4 + k) -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 = 25 k = 25 Simplifying k = 25
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