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Simplifying 20 + k = -20 + -9k Solving 20 + k = -20 + -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. 20 + k + 9k = -20 + -9k + 9k Combine like terms: k + 9k = 10k 20 + 10k = -20 + -9k + 9k Combine like terms: -9k + 9k = 0 20 + 10k = -20 + 0 20 + 10k = -20 Add '-20' to each side of the equation. 20 + -20 + 10k = -20 + -20 Combine like terms: 20 + -20 = 0 0 + 10k = -20 + -20 10k = -20 + -20 Combine like terms: -20 + -20 = -40 10k = -40 Divide each side by '10'. k = -4 Simplifying k = -4
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