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Simplifying k + 20k + -4 = 9 Reorder the terms: -4 + k + 20k = 9 Combine like terms: k + 20k = 21k -4 + 21k = 9 Solving -4 + 21k = 9 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + 21k = 9 + 4 Combine like terms: -4 + 4 = 0 0 + 21k = 9 + 4 21k = 9 + 4 Combine like terms: 9 + 4 = 13 21k = 13 Divide each side by '21'. k = 0.619047619 Simplifying k = 0.619047619
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