$$3 \times (4 { x }^{ 2 } -3x+1)+2 \times ( { x }^{ 2 } -x+5)-(3 { x }^{ 2 } -x-4)$$
$11x^{2}-10x+17$
$$12x^{2}-9x+3+2\left(x^{2}-x+5\right)-\left(3x^{2}-x-4\right)$$
$$12x^{2}-9x+3+2x^{2}-2x+10-\left(3x^{2}-x-4\right)$$
$$14x^{2}-9x+3-2x+10-\left(3x^{2}-x-4\right)$$
$$14x^{2}-11x+3+10-\left(3x^{2}-x-4\right)$$
$$14x^{2}-11x+13-\left(3x^{2}-x-4\right)$$
$$14x^{2}-11x+13-3x^{2}+x+4$$
$$11x^{2}-11x+13+x+4$$
$$11x^{2}-10x+13+4$$
$$11x^{2}-10x+17$$
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