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Simplifying x2 + -1kx + 80 = 0 Reorder the terms: 80 + -1kx + x2 = 0 Solving 80 + -1kx + x2 = 0 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-80' to each side of the equation. 80 + -1kx + -80 + x2 = 0 + -80 Reorder the terms: 80 + -80 + -1kx + x2 = 0 + -80 Combine like terms: 80 + -80 = 0 0 + -1kx + x2 = 0 + -80 -1kx + x2 = 0 + -80 Combine like terms: 0 + -80 = -80 -1kx + x2 = -80 Add '-1x2' to each side of the equation. -1kx + x2 + -1x2 = -80 + -1x2 Combine like terms: x2 + -1x2 = 0 -1kx + 0 = -80 + -1x2 -1kx = -80 + -1x2 Divide each side by '-1x'. k = 80x-1 + x Simplifying k = 80x-1 + x
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