$\lim_{x\to\frac{1}{2}}\left(\frac{6x^2+5x-4}{4x^2+16x+9}\right)$
$x+2y-3z=9$
$\left(a+b-c\right)\left(a-b-3c\right)$
$\int\frac{x^2}{\sqrt{21-4x-x^2}}dx$
$x^2+4x=y$
$\left(x^{a+x}-8\right)\left(x^{a+1}+9\right)$
$f\left(x\right)=\frac{6}{3x^7}+2tanx$
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