$9x-x$
$4x^3+16x^2-x-4$
$5\left(a-16\right)-4\ge6$
$\left(3x^{\left(2\right)}\right)^{\left(2\right)}\left(2x\right)$
$\tan\left(\theta\right)=\frac{7}{9}$
$4x^2+y^2=1$
$7ab-3a^2+4b^2+8a^2-4ab-10b^2$
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