$\frac{\left|8-3\right|}{\left|15-7\right|}$
$3\:\frac{3}{5}\cdot5$
$\sqrt{5\frac{6}{3}}$
$243-1+78\cdot17-4\cdot19$
$\left(6-3b\right)^2$
$\left(2a^2b\right)\left(6ab^{-3}\right)\left(5a^{-2}b\right)$
$\left(a\:+\:b\:+\:c\right)^4$
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