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Simplifying 9x2 + -1kx + 81 = 0 Reorder the terms: 81 + -1kx + 9x2 = 0 Solving 81 + -1kx + 9x2 = 0 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-81' to each side of the equation. 81 + -1kx + -81 + 9x2 = 0 + -81 Reorder the terms: 81 + -81 + -1kx + 9x2 = 0 + -81 Combine like terms: 81 + -81 = 0 0 + -1kx + 9x2 = 0 + -81 -1kx + 9x2 = 0 + -81 Combine like terms: 0 + -81 = -81 -1kx + 9x2 = -81 Add '-9x2' to each side of the equation. -1kx + 9x2 + -9x2 = -81 + -9x2 Combine like terms: 9x2 + -9x2 = 0 -1kx + 0 = -81 + -9x2 -1kx = -81 + -9x2 Divide each side by '-1x'. k = 81x-1 + 9x Simplifying k = 81x-1 + 9x
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