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Simplifying k + 9 = 2k Reorder the terms: 9 + k = 2k Solving 9 + k = 2k Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-2k' to each side of the equation. 9 + k + -2k = 2k + -2k Combine like terms: k + -2k = -1k 9 + -1k = 2k + -2k Combine like terms: 2k + -2k = 0 9 + -1k = 0 Add '-9' to each side of the equation. 9 + -9 + -1k = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -1k = 0 + -9 -1k = 0 + -9 Combine like terms: 0 + -9 = -9 -1k = -9 Divide each side by '-1'. k = 9 Simplifying k = 9
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