$\frac{5}{6}x\frac{2}{3}$
$20a+15b;\:a=3b=5$
$-3a+8a-b+4$
$6x^2+xyt-2y^2-x+11-15$
$\lim_{x\to-1}\frac{x^2+8x+16}{x^2+x+3}$
$\left(\frac{b^{7}}{4^{5}}\right)^{-3}$
$\left(w^2+4q\right)\left(w^2-4q\right)$
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