$25x^6+10x^2+35x$
$5m^2-5m+15$
$2+7.82$
$2\cdot\:\:cos\left(7x\right)+\sqrt{3}=0$
$-1.1k=1.21$
$100xy+20x^2$
$-\frac{x^2+x-8}{\left(x-3\right)\left(x+5\right)}=\frac{x}{x-3}$
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