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Simplifying -4 = k + -4 + 8k Reorder the terms: -4 = -4 + k + 8k Combine like terms: k + 8k = 9k -4 = -4 + 9k Add '4' to each side of the equation. -4 + 4 = -4 + 4 + 9k Combine like terms: -4 + 4 = 0 0 = -4 + 4 + 9k Combine like terms: -4 + 4 = 0 0 = 0 + 9k 0 = 9k Solving 0 = 9k Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-9k' to each side of the equation. 0 + -9k = 9k + -9k Remove the zero: -9k = 9k + -9k Combine like terms: 9k + -9k = 0 -9k = 0 Divide each side by '-9'. k = 0 Simplifying k = 0
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