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Simplifying D = (x2 + -6x + -4) + (5x2 + 9x + -7) Reorder the terms: D = (-4 + -6x + x2) + (5x2 + 9x + -7) Remove parenthesis around (-4 + -6x + x2) D = -4 + -6x + x2 + (5x2 + 9x + -7) Reorder the terms: D = -4 + -6x + x2 + (-7 + 9x + 5x2) Remove parenthesis around (-7 + 9x + 5x2) D = -4 + -6x + x2 + -7 + 9x + 5x2 Reorder the terms: D = -4 + -7 + -6x + 9x + x2 + 5x2 Combine like terms: -4 + -7 = -11 D = -11 + -6x + 9x + x2 + 5x2 Combine like terms: -6x + 9x = 3x D = -11 + 3x + x2 + 5x2 Combine like terms: x2 + 5x2 = 6x2 D = -11 + 3x + 6x2 Solving D = -11 + 3x + 6x2 Solving for variable 'D'. Move all terms containing D to the left, all other terms to the right. Simplifying D = -11 + 3x + 6x2
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