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Simplifying 9 + -0.4k = 9 Add '-9' to each side of the equation. 9 + -9 + -0.4k = 9 + -9 Combine like terms: 9 + -9 = 0 0 + -0.4k = 9 + -9 -0.4k = 9 + -9 Combine like terms: 9 + -9 = 0 -0.4k = 0 Solving -0.4k = 0 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Divide each side by '-0.4'. k = 0 Simplifying k = 0
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