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Simplifying 9 = -3 + k + 2k Combine like terms: k + 2k = 3k 9 = -3 + 3k Solving 9 = -3 + 3k Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-3k' to each side of the equation. 9 + -3k = -3 + 3k + -3k Combine like terms: 3k + -3k = 0 9 + -3k = -3 + 0 9 + -3k = -3 Add '-9' to each side of the equation. 9 + -9 + -3k = -3 + -9 Combine like terms: 9 + -9 = 0 0 + -3k = -3 + -9 -3k = -3 + -9 Combine like terms: -3 + -9 = -12 -3k = -12 Divide each side by '-3'. k = 4 Simplifying k = 4
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