$\left(2c+3b\right)\left(d+c\right)\left(2b+3x\right)\left(m+\right)$
$-25x^250x-21$
$\left|\left(2x+1\right)^2\right|$
$\left(2x^2+3y^5\right)^2$
$\frac{x-2}{2x+4}+\frac{2}{x^2+5x+6}=\frac{5}{x+3}$
$\left(\frac{50}{x-4}+8\right)$
$\lim_{x\to\frac{\pi}{2}}\left(\frac{140-7\pi}{cos\left(2\pi-x\right)}\right)$
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