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Simplifying k + -35 = 21 Reorder the terms: -35 + k = 21 Solving -35 + k = 21 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '35' to each side of the equation. -35 + 35 + k = 21 + 35 Combine like terms: -35 + 35 = 0 0 + k = 21 + 35 k = 21 + 35 Combine like terms: 21 + 35 = 56 k = 56 Simplifying k = 56