$665-\left[\left(34+28\right)+\left(73-15\right)-\left(12+43\right)\right]$
$3^3\cdot3^4\cdot3$
$-5xy+8xt$
$\int\frac{x^3-x+3}{x^2-x-2}dx$
$x^2+9x-35$
$-7x-3x\:\:mas\:6x$
$\left(x+2y\right)\frac{dy}{dx}=-y-2x$
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