7*(7-7)+7-7=0
(7+7-7-7)*7=0
(7*7/7-7)*7=0
(7-7+7-7)/7=0
(7*7/7-7)/7=0
(7+7+7)*(7-7)=0
(7-7-7)*(7-7)=0
(7-7+7)*(7-7)=0
(7+7+7)/(7-7)=0
(7-7-7)/(7-7)=0
(7-7+7)/(7-7)=0
7*7*7*(7-7)=0
7*7/7*(7-7)=0
7/7/7*(7-7)=0
7*7*7/(7-7)=0
7*7/7/(7-7)=0
7/7/7/(7-7)=0
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