(((-3÷-7)+3)×7)
((-3-(3÷7))×-7)
(((-3÷7)-3)×-7)
(-7×(-3-(3÷7)))
(-7×((-3÷7)-3))
((3+(-3÷-7))×7)
(7×((-3÷-7)+3))
(7×(3+(-3÷-7)))