340 - 72 : (-7 + 3) * (-6) =

First, calculate the expression inside the parentheses: $$-7 + 3 = -4$$.

Next, perform the division: $$72 \div -4 = -18$$.

Then, perform the multiplication: $$-18 \times -6 = 108$$.

Finally, perform the subtraction: $$340 - 108 = 232$$.