Simplify (7x+4+6x^2)+(6+2x^2-4x)

$(7 x + 4 + 6 x^{2}) + (6 + 2 x^{2} - 4 x)$

Remove parentheses.

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

Subtract $4 x$ from $7 x$ .

$3 x + 4 + 6 x^{2} + 6 + 2 x^{2}$

Add $4$ and $6$ .

$3 x + 6 x^{2} + 10 + 2 x^{2}$

Add $6 x^{2}$ and $2 x^{2}$ .

$3 x + 8 x^{2} + 10$

Reorder $3 x$ and $8 x^{2}$ .

$8 x^{2} + 3 x + 10$

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