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Simplifying 0 = 4x2 + -20x + k Reorder the terms: 0 = k + -20x + 4x2 Solving 0 = k + -20x + 4x2 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-1k' to each side of the equation. 0 + -1k = k + -20x + -1k + 4x2 Remove the zero: -1k = k + -20x + -1k + 4x2 Reorder the terms: -1k = k + -1k + -20x + 4x2 Combine like terms: k + -1k = 0 -1k = 0 + -20x + 4x2 -1k = -20x + 4x2 Divide each side by '-1'. k = 20x + -4x2 Simplifying k = 20x + -4x2
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