$x^5+11x^4+33x^3-11x^2-154x-120$
$2x+1=u$
$\left(-6\right)-\left(-3\right)+\left(-2\right)-\left(-8\right)$
$\frac{14}{15}x-\frac{7}{6}x$
$-6y^5-6y^5-\frac{7}{2}xz+7xz-\frac{5}{3}xz+\frac{6}{3}xz$
$x^2-5^2+x^2+5^2-10x$
$\lim_{x\to0}\frac{\left(x^2-5x+6\right)}{x^2-2x}$
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