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Simplifying 20 = 4 + k + 7k Combine like terms: k + 7k = 8k 20 = 4 + 8k Solving 20 = 4 + 8k Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-8k' to each side of the equation. 20 + -8k = 4 + 8k + -8k Combine like terms: 8k + -8k = 0 20 + -8k = 4 + 0 20 + -8k = 4 Add '-20' to each side of the equation. 20 + -20 + -8k = 4 + -20 Combine like terms: 20 + -20 = 0 0 + -8k = 4 + -20 -8k = 4 + -20 Combine like terms: 4 + -20 = -16 -8k = -16 Divide each side by '-8'. k = 2 Simplifying k = 2
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