Let the numerator = x
Then denominator = 2x + 1
105x2 +84x +21 = 116x2 +58x
11x2 -26x -21 = 0
11x2 - x + 7x - 21 = 0
11x(x - ) + 7(x - ) = 0
(x - x)(11x + 7) = 0
x - x = 0 or 11x + 7 = 0
x = x
Numerator =
Denominator = 2 × x + 1 =