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Simplifying 18 + -9k = -20 + 10k Solving 18 + -9k = -20 + 10k Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-10k' to each side of the equation. 18 + -9k + -10k = -20 + 10k + -10k Combine like terms: -9k + -10k = -19k 18 + -19k = -20 + 10k + -10k Combine like terms: 10k + -10k = 0 18 + -19k = -20 + 0 18 + -19k = -20 Add '-18' to each side of the equation. 18 + -18 + -19k = -20 + -18 Combine like terms: 18 + -18 = 0 0 + -19k = -20 + -18 -19k = -20 + -18 Combine like terms: -20 + -18 = -38 -19k = -38 Divide each side by '-19'. k = 2 Simplifying k = 2
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