$\frac{15x^3y^5}{5xy^4}x-\frac{20x^7y^2}{10x^5y}$
$-7x^2-8$
$2x^2\frac{dy}{dx}-3xy+y^2=0$
$x+13=5$
$\left(y+11\right)\:=\:\left(x+2\right)\left(y+13\right)$
$10b-30b^2$
$8=8v-4v-32$
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