The CompoundExpression command evaluates expressions and returns the result of the last expression.

$\mathrm{with}\left(\mathrm{MmaTranslator}\left[\mathrm{Mma}\right]\right)\:$

$\mathrm{CompoundExpression}\left(\mathrm{assign}\left(a\,5\right)\,\mathrm{assign}\left(b\,9-a\right)\,\mathrm{assign}\left(c\,2b\right)\,c\right)$

$8$