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Simplifying -21 + (-8k) + 4 = 23 Reorder the terms: -21 + 4 + (-8k) = 23 Combine like terms: -21 + 4 = -17 -17 + (-8k) = 23 Solving -17 + (-8k) = 23 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '17' to each side of the equation. -17 + 17 + (-8k) = 23 + 17 Combine like terms: -17 + 17 = 0 0 + (-8k) = 23 + 17 (-8k) = 23 + 17 Combine like terms: 23 + 17 = 40 (-8k) = 40 Divide each side by '-8'. k = -5 Simplifying k = -5
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