$6x^2+7x=3$
$\left(x^2+1\right)\left(x^4+1\right)$
$\int\left(\frac{x^{2}-9x+14}{x-2}\right)dx$
$6x+2y=5x-4y+8$
$\sqrt{\frac{3x^2-1}{3x^2+1}}$
$\lim_{x\to\infty}\left(\left(\frac{x^2+1}{x+2}\right)^{\frac{1}{x}}\right)$
$\lim_{x\to-1}\left(x^2+x-1\right)$
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