$$\frac { 21 x ^ { 2 } - 8 x ^ { 2 } + 8 x + 8 } { 21 x - 3 }$$
$\frac{13x^{2}+8x+8}{3\left(7x-1\right)}$
$$\frac{13x^{2}+8x+8}{21x-3}$$
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