D=-(x^2-6x-4)+(5x^2+9x-7)

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Solution for D=-(x^2-6x-4)+(5x^2+9x-7) equation: 


Simplifying
D = -1(x2 + -6x + -4) + (5x2 + 9x + -7)

Reorder the terms:
D = -1(-4 + -6x + x2) + (5x2 + 9x + -7)
D = (-4 * -1 + -6x * -1 + x2 * -1) + (5x2 + 9x + -7)
D = (4 + 6x + -1x2) + (5x2 + 9x + -7)

Reorder the terms:
D = 4 + 6x + -1x2 + (-7 + 9x + 5x2)

Remove parenthesis around (-7 + 9x + 5x2)
D = 4 + 6x + -1x2 + -7 + 9x + 5x2

Reorder the terms:
D = 4 + -7 + 6x + 9x + -1x2 + 5x2

Combine like terms: 4 + -7 = -3
D = -3 + 6x + 9x + -1x2 + 5x2

Combine like terms: 6x + 9x = 15x
D = -3 + 15x + -1x2 + 5x2

Combine like terms: -1x2 + 5x2 = 4x2
D = -3 + 15x + 4x2

Solving
D = -3 + 15x + 4x2

Solving for variable 'D'.

Move all terms containing D to the left, all other terms to the right.

Simplifying
D = -3 + 15x + 4x2

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