$x^{13}\cdot x\cdot x^{-6}$
$-3\left\{5-4\left[-2\left(3-8+1\right)-8\right]-2+9\right\}$
$-3y-5=10$
$\left(-1^3\right)^2$
$\lim_{x\to\infty}\left(\frac{7x^4-x^3+3}{4x^5+x^2+4}\right)$
$4x^2-4x+65$
$x-1-\frac{x}{x+5}$
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