$\frac{9}{25}n^2+\frac{2}{15}nm+\frac{1}{18}m^2$
$\frac{d}{dy}\left(xz-z^2+\ln\:\left(z\right)=x^2y+y\right)\:$
$3x^2+6x-9=0$
$1000g^2-100$
$x-6\le187x$
$\:4\left(5\:-\:3y\:+\:2x\right)\:+\:9y\:-\:17$
$8x^4y^2\:-36x^2yz^3\:+48xy^4\:$
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