$2\cdot\left(1-3\cdot\left(2-1\right)\right)$
$\lim_{x\to-1}\left(\frac{5x^4+4x^3+6x+5}{x+1}\right)$
$x\:-\:5\:+\:2x\:-\:3$
$\frac{27^{3n+6}}{27^{3n+6}}$
$-\left[\left(-16\right)+\left(-16\right)\right]$
$3^2-12^3+5^2$
$\frac{5x^2-28x+20}{5x-3}$
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