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Simplifying -1 + 2k + -1 = 3 + k Reorder the terms: -1 + -1 + 2k = 3 + k Combine like terms: -1 + -1 = -2 -2 + 2k = 3 + k Solving -2 + 2k = 3 + 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. -2 + 2k + -1k = 3 + k + -1k Combine like terms: 2k + -1k = 1k -2 + 1k = 3 + k + -1k Combine like terms: k + -1k = 0 -2 + 1k = 3 + 0 -2 + 1k = 3 Add '2' to each side of the equation. -2 + 2 + 1k = 3 + 2 Combine like terms: -2 + 2 = 0 0 + 1k = 3 + 2 1k = 3 + 2 Combine like terms: 3 + 2 = 5 1k = 5 Divide each side by '1'. k = 5 Simplifying k = 5
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