$\lim_{x\to+\infty}\left(\ln\left(10x\right)-\ln\left(x+1\right)\right)$
$-2x^2\left(x+5\right)$
$5x-3x+x-4+2x$
$\lim_{x\to4}\left(\frac{\left|x^2-3x-4\right|+2x-8}{\sqrt{x}-2}\right)$
$-7x-2-9y+10x$
$\frac{dy}{dx}-2xln\left(x^2+1\right)=0$
$\int7xe^{5x^2}dx$
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