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(14x2)-9
Since all of the coefficients are even, it is possible to factor out a 2.
It is a quadratic expression and when factored it is: (7x+5)(2x-7)
Area of room = width * length = (2x-1)*(7x+3) = 14x2 + 6x - 7x - 3 = 14x2 - x - 3 sq feet
2/7 of 14 is 4 since 14(2/7)=14x2/7=2x2