$2x+3y-2y-x$
$4-x^2\ge0$
$t^2i-5tj+8t^3k$
$16a^4+24a^2b^2+9b^4$
$\int\left(\frac{x^{2\:}}{\sqrt[3]{1-2x}}\right)dx$
$-\frac{2}{x\left(x+2\right)}=\frac{x+3}{x+2}$
$\left(5m-8x\right)^2$
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