$-2\cdot\:4$
$2x+3;x=2$
$\lim\:_{x\to\:\:1}\left(\frac{\sqrt{x-1}}{x-1}\right)$
$\left(2a-5\right)\left(3+2a\right)$
$\left(5m-9n\right)^3$
$\frac{4x^4-2x^3+x-7}{2x^2-1}$
$\frac{14}{x^2-2x-48}$
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