$\left(9^{-n}\right)^3$
$4x-5y+3x+2x+6y$
$\left(xy+x\right)dy=\left(x^2+1\right)dx$
$\frac{d}{dx}\frac{x}{a}+\frac{a}{x}$
$8xy+2zy-6xy$
$\int\frac{x}{x^4+7}dx$
$6x^2+31x+30=0$
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