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Simplifying 4k + -1 + 3k = 21 Reorder the terms: -1 + 4k + 3k = 21 Combine like terms: 4k + 3k = 7k -1 + 7k = 21 Solving -1 + 7k = 21 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 = 21 + 1 Combine like terms: -1 + 1 = 0 0 + 7k = 21 + 1 7k = 21 + 1 Combine like terms: 21 + 1 = 22 7k = 22 Divide each side by '7'. k = 3.142857143 Simplifying k = 3.142857143
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