$\left(3x^2-x^{-3}\right)\left(-x^{-1}+2x\right)$
$2\left(x+2y\right)+\left(y-x\right)y'=0$
$-z^2+y^2=x^2+25$
$121+22y+y^2$
$\int_{4\sqrt{9x-x^2}}^4dx$
$-5-2+4-7+8-3+\left\{5+3\right\}-8+\left(5-7\right)-3-5$
$xy^'+4y=x^3-x$
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