$5m^4-2n^4-5m^4+3n^4$
$\frac{3x^2}{1-2x}$
$-18-\left(-23\right)+45$
$1+b+3ab+3a$
$\frac{x^{n^n}}{x^n}$
$49x^2\:_{-\:196}\:=0$
$\left(x+2\right)\left(x-1\right)\le0$
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