$$(4x^{2}-3x+2)+(3x^{4}+2x^{3}+6x-7)$$
$3x^{4}+2x^{3}+4x^{2}+3x-5$
$$4x^{2}+3x+2+3x^{4}+2x^{3}-7$$
$$4x^{2}+3x-5+3x^{4}+2x^{3}$$
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$12x^{3}+6x^{2}+8x+3$
