$x\frac{dy}{dx}+y=x\cdot e^x$
$\left(\frac{5mn}{-3m^2}\right)^{-2}$
$-7g+3\left(4+6g\right)$
$3x+1\ge-2+4x$
$-7+1^2+2$
$\left(8n+7m\right)^2$
$\lim_{x\to\infty}\left(\frac{\left(7x-2\right)\left(6x-1\right)}{\left(4+3x^2\right)\left(4x-1\right)}\right)$
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