$3m-2n-2nx^4+3nx^4$
$z^2+14z$
$7m\:-\:4r\:=\:5$
$sec\left(x\right)+\frac{sin\left(x\right)}{cos\left(x\right)}=\frac{cos\left(x\right)}{1-sin\left(x\right)}$
$a^2-16a-36$
$53^3-43^{-2}-2+6-2^{-2}-7-2^3$
$\frac{8x^2-10y^2}{4x+5y}$
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