$\left(5y-9\right)\left(5y+9\right)$
$0,8yz^2+1,2yz^2-3,2yz^2-1,7yz^2$
$\left(y^2+2yx\right)dx+x^2dy=0$
$\frac{1}{2m}\left(\frac{2}{3}m-\frac{4}{3}\right)$
$-x^2-4x+45$
$\left(8x^{m+n}-9\right)\left(x^{m+n}-1\right)$
$2x\:+\:18y\:and\:2\left(x\:+\:9y\right)$
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