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Simplifying 400 = 200 + -5k Solving 400 = 200 + -5k Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '5k' to each side of the equation. 400 + 5k = 200 + -5k + 5k Combine like terms: -5k + 5k = 0 400 + 5k = 200 + 0 400 + 5k = 200 Add '-400' to each side of the equation. 400 + -400 + 5k = 200 + -400 Combine like terms: 400 + -400 = 0 0 + 5k = 200 + -400 5k = 200 + -400 Combine like terms: 200 + -400 = -200 5k = -200 Divide each side by '5'. k = -40 Simplifying k = -40
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