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Simplifying 4x2 + -20x + k = 4x2 + -2xa + a2 Reorder the terms: k + -20x + 4x2 = 4x2 + -2xa + a2 Reorder the terms: k + -20x + 4x2 = -2ax + a2 + 4x2 Add '-4x2' to each side of the equation. k + -20x + 4x2 + -4x2 = -2ax + a2 + 4x2 + -4x2 Combine like terms: 4x2 + -4x2 = 0 k + -20x + 0 = -2ax + a2 + 4x2 + -4x2 k + -20x = -2ax + a2 + 4x2 + -4x2 Combine like terms: 4x2 + -4x2 = 0 k + -20x = -2ax + a2 + 0 k + -20x = -2ax + a2 Solving k + -20x = -2ax + a2 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '20x' to each side of the equation. k + -20x + 20x = -2ax + a2 + 20x Combine like terms: -20x + 20x = 0 k + 0 = -2ax + a2 + 20x k = -2ax + a2 + 20x Simplifying k = -2ax + a2 + 20x
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