$\left(_{\text{-4}}\right):-1$
$\left(r^4\right)^8$
$15x+2=47$
$4x^2-28xy+49y^2$
$\frac{dy}{dx}\left(xy+x^2y^2=5\right)$
$x-2y=0$
$2x^2+x+xy=1$
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