$x^2-2x-4y+5=0$
$s^7t^6u^{-1}\:x\:s^0t^4u^{-1}$
$\left(\:x^{2n}+2\right)\left(x^{2n}-2\right)$
$5x-1<7x-9$
$\frac{a^{2}-3a+2}{a-1}$
$35-\left(-16\right)$
$3-3^2+3-2-3+3^2$
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