$-6-19+-14-5+-8-13+27$
$21ab+10ab^2-101a^2$
$-2a-10\left(-7-3a\right)$
$\frac{x+5}{\left(x^2+10x+25\right)^3}$
$\frac{30x^{5}\cdot11x^{4}+12x^{3}+52x^{2}+x-12}{5x+4}$
$10x-10-6\left(x+2\right)$
$\lim\:_{x\to\:\infty}\left(\frac{\pi-2\arctan\left(x\right)}{e^{\frac{3}{x}}-1}\right)$
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