$xy+xy^2+x^3y=7y^2$
$16m^4-25m^2n^29n^4$
$-x^2\:+\:8x\:+416\:>0$
$\frac{5s^{-7}}{10s^{-9}}$
$2y^23x$
$\frac{4x^2-x+1}{4+4x^3}$
$4^4-4^3-4^2-4-10$
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