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Simplifying -1k = -9(k + -10) Reorder the terms: -1k = -9(-10 + k) -1k = (-10 * -9 + k * -9) -1k = (90 + -9k) Solving -1k = 90 + -9k Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '9k' to each side of the equation. -1k + 9k = 90 + -9k + 9k Combine like terms: -1k + 9k = 8k 8k = 90 + -9k + 9k Combine like terms: -9k + 9k = 0 8k = 90 + 0 8k = 90 Divide each side by '8'. k = 11.25 Simplifying k = 11.25
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