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Simplifying 5k + 7k + -8 = 28 Reorder the terms: -8 + 5k + 7k = 28 Combine like terms: 5k + 7k = 12k -8 + 12k = 28 Solving -8 + 12k = 28 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + 12k = 28 + 8 Combine like terms: -8 + 8 = 0 0 + 12k = 28 + 8 12k = 28 + 8 Combine like terms: 28 + 8 = 36 12k = 36 Divide each side by '12'. k = 3 Simplifying k = 3
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