$50c^4-2c^2$
$-2m^2-14m-20$
$\frac{\left(-5\right)\left(-6\right)\left(-3\right)}{9}$
$k^2-7k$
$6\sin x+1=0$
$\frac{1}{m+n}+\frac{m}{n^2+m^2}$
$5a+4b+6c\:=\:1$
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