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Simplifying 90 = -9 + -9k Solving 90 = -9 + -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. 90 + 9k = -9 + -9k + 9k Combine like terms: -9k + 9k = 0 90 + 9k = -9 + 0 90 + 9k = -9 Add '-90' to each side of the equation. 90 + -90 + 9k = -9 + -90 Combine like terms: 90 + -90 = 0 0 + 9k = -9 + -90 9k = -9 + -90 Combine like terms: -9 + -90 = -99 9k = -99 Divide each side by '9'. k = -11 Simplifying k = -11
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