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Simplifying 6k + k + -1 = 139 Reorder the terms: -1 + 6k + k = 139 Combine like terms: 6k + k = 7k -1 + 7k = 139 Solving -1 + 7k = 139 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 7k = 139 + 1 Combine like terms: -1 + 1 = 0 0 + 7k = 139 + 1 7k = 139 + 1 Combine like terms: 139 + 1 = 140 7k = 140 Divide each side by '7'. k = 20 Simplifying k = 20
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