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Simplifying 15 + 5 = 5(8 + -1k) Combine like terms: 15 + 5 = 20 20 = 5(8 + -1k) 20 = (8 * 5 + -1k * 5) 20 = (40 + -5k) Solving 20 = 40 + -5k Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '5k' to each side of the equation. 20 + 5k = 40 + -5k + 5k Combine like terms: -5k + 5k = 0 20 + 5k = 40 + 0 20 + 5k = 40 Add '-20' to each side of the equation. 20 + -20 + 5k = 40 + -20 Combine like terms: 20 + -20 = 0 0 + 5k = 40 + -20 5k = 40 + -20 Combine like terms: 40 + -20 = 20 5k = 20 Divide each side by '5'. k = 4 Simplifying k = 4
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