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Simplifying (-1x2 + -9x) + (x2 + 3x + -8) = 0 Reorder the terms: (-9x + -1x2) + (x2 + 3x + -8) = 0 Remove parenthesis around (-9x + -1x2) -9x + -1x2 + (x2 + 3x + -8) = 0 Reorder the terms: -9x + -1x2 + (-8 + 3x + x2) = 0 Remove parenthesis around (-8 + 3x + x2) -9x + -1x2 + -8 + 3x + x2 = 0 Reorder the terms: -8 + -9x + 3x + -1x2 + x2 = 0 Combine like terms: -9x + 3x = -6x -8 + -6x + -1x2 + x2 = 0 Combine like terms: -1x2 + x2 = 0 -8 + -6x + 0 = 0 -8 + -6x = 0 Solving -8 + -6x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + -6x = 0 + 8 Combine like terms: -8 + 8 = 0 0 + -6x = 0 + 8 -6x = 0 + 8 Combine like terms: 0 + 8 = 8 -6x = 8 Divide each side by '-6'. x = -1.333333333 Simplifying x = -1.333333333
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