The total area for both rooms is expressed as 2x^2+x+3 square meters.  The tile in the dining room was already replaced, so we know the area of that room is 2x^2_2x square meters
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The remaining area to be carpeted is 2x²+x+3-(2x²-2x)=2x²+x+3-2x²+2x=3x+3 sq m.

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