$\lim_{x\to0}\left(\frac{7-sin\left(x\right)-7x}{4x-2e^x+2e^{-x}}\right)$
$\left(x^4+5x^3+x^2+20x-12\right):\left(x^2+4\right)$
$16+x=-1$
$\left(2a+5\right)\left(8a-1\right)$
$\lim_{x\to-2}\left(\frac{5x^2+10x}{x^2+6x-16}\right)$
$5x^2\cdot6x-10$
$4ab-3bc$
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