Simplify 5x-4x^2-1+x-8x^2+7

$5 x - 4 x^{2} - 1 + x - 8 x^{2} + 7$

Add $5 x$ and $x$ .

$6 x - 4 x^{2} - 1 - 8 x^{2} + 7$

Subtract $8 x^{2}$ from $- 4 x^{2}$ .

$6 x - 12 x^{2} - 1 + 7$

Simplify the expression.

Add $- 1$ and $7$ .

$6 x - 12 x^{2} + 6$

Reorder $6 x$ and $- 12 x^{2}$ .

$- 12 x^{2} + 6 x + 6$

$- 12 x^{2} + 6 x + 6$

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