$$\frac{42x^{2}+18x+9}{42x^{2}-9}-\frac{2x^{2}+3x+2}{2x^{2}-2x-3}$$
$\frac{\left(x+1\right)\left(58x^{2}+12x+3\right)}{\left(14x^{2}-3\right)\left(3+2x-2x^{2}\right)}$
$-\frac{58x^{3}+70x^{2}+15x+3}{\left(14x^{2}-3\right)\left(2x^{2}-2x-3\right)}$
