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Simplifying -4 = -0.4k Solving -4 = -0.4k Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '0.4k' to each side of the equation. -4 + 0.4k = -0.4k + 0.4k Combine like terms: -0.4k + 0.4k = 0.0 -4 + 0.4k = 0.0 Add '4' to each side of the equation. -4 + 4 + 0.4k = 0.0 + 4 Combine like terms: -4 + 4 = 0 0 + 0.4k = 0.0 + 4 0.4k = 0.0 + 4 Combine like terms: 0.0 + 4 = 4 0.4k = 4 Divide each side by '0.4'. k = 10 Simplifying k = 10
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