$\left(13x^3-5x^2+2x-4\right)-\left(8x^4+10x^3-x^2\right)$
$3^5a^7$
$2w+9=8w+21$
$\frac{x-2}{x+2}+\frac{x+2}{x-2}$
$x^2+x^2z$
$\left(-2b-4c-3a\right)+\left(-5a-3b-c\right)$
$3\tan^2\left(x\right)-\tan\left(x\right)=0$
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