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Simplifying 9(k + -4) = 81 Reorder the terms: 9(-4 + k) = 81 (-4 * 9 + k * 9) = 81 (-36 + 9k) = 81 Solving -36 + 9k = 81 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '36' to each side of the equation. -36 + 36 + 9k = 81 + 36 Combine like terms: -36 + 36 = 0 0 + 9k = 81 + 36 9k = 81 + 36 Combine like terms: 81 + 36 = 117 9k = 117 Divide each side by '9'. k = 13 Simplifying k = 13
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