$\frac{90}{4}+\:\frac{5}{-2}$
$\lim_{x\to\infty}\left(\frac{4\cdot x+sin\cdot x}{2\cdot x-sin\cdot x}\right)$
$a:184\:c:513$
$x^9\cdot x$
$7x^2-14x+28$
$\left(1-4m\right)\left(m^2-3m+8\right)$
$b\left(b+a^2-1\right)$
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