$\frac{3xy+2}{5}+\frac{3xy-1}{2}$
$6ctgx\:=\:2\sqrt{3}$
$\frac{4}{x}+\frac{8}{x-2}=5$
$5-\left(+8+6\right)$
$3n+3=258$
$\left(\frac{8}{6}z^6\right)$
$\frac{10}{\left(x+2\right)}=\frac{7}{\left(x+2\right)}$
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