$\lim_{x\to\infty}\left(\frac{x+2^n}{2n+3^n}\right)$
$\left(8\right)-\left(-23\right)+\left(42\right)-\left(-31\right)+\left(-36\right)$
$3p^2-147$
$12a^3-2a$
$-\left[\left(-4\right)-\left(-3\right)\right]$
$\frac{-xy^2z}{-xy^2z}$
$27-9x$
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