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Simplifying 4 = k + -9 Reorder the terms: 4 = -9 + k Solving 4 = -9 + 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. 4 + -1k = -9 + k + -1k Combine like terms: k + -1k = 0 4 + -1k = -9 + 0 4 + -1k = -9 Add '-4' to each side of the equation. 4 + -4 + -1k = -9 + -4 Combine like terms: 4 + -4 = 0 0 + -1k = -9 + -4 -1k = -9 + -4 Combine like terms: -9 + -4 = -13 -1k = -13 Divide each side by '-1'. k = 13 Simplifying k = 13
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