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Simplifying x(x + -3) = x2 + 6x + -9 Reorder the terms: x(-3 + x) = x2 + 6x + -9 (-3 * x + x * x) = x2 + 6x + -9 (-3x + x2) = x2 + 6x + -9 Reorder the terms: -3x + x2 = -9 + 6x + x2 Add '-1x2' to each side of the equation. -3x + x2 + -1x2 = -9 + 6x + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -3x + 0 = -9 + 6x + x2 + -1x2 -3x = -9 + 6x + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -3x = -9 + 6x + 0 -3x = -9 + 6x Solving -3x = -9 + 6x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6x' to each side of the equation. -3x + -6x = -9 + 6x + -6x Combine like terms: -3x + -6x = -9x -9x = -9 + 6x + -6x Combine like terms: 6x + -6x = 0 -9x = -9 + 0 -9x = -9 Divide each side by '-9'. x = 1 Simplifying x = 1
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