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Verified answer
(3x⁴-2x³+4x²-10x+12)+(x-2)=3x⁴-2x³+4x²-10x+12+x-2
=3x⁴-2x³+4x²-10x+x+12-2
=3x⁴-2x³+4x²-9x+10
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