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Simplifying x(x + -8) = x2 + 3x + 9 Reorder the terms: x(-8 + x) = x2 + 3x + 9 (-8 * x + x * x) = x2 + 3x + 9 (-8x + x2) = x2 + 3x + 9 Reorder the terms: -8x + x2 = 9 + 3x + x2 Add '-1x2' to each side of the equation. -8x + x2 + -1x2 = 9 + 3x + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -8x + 0 = 9 + 3x + x2 + -1x2 -8x = 9 + 3x + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -8x = 9 + 3x + 0 -8x = 9 + 3x Solving -8x = 9 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. -8x + -3x = 9 + 3x + -3x Combine like terms: -8x + -3x = -11x -11x = 9 + 3x + -3x Combine like terms: 3x + -3x = 0 -11x = 9 + 0 -11x = 9 Divide each side by '-11'. x = -0.8181818182 Simplifying x = -0.8181818182
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