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100-[36+6×9-(a÷3+15)]÷3=76

Răspuns :

-[36+54-(a:3+15)]:3=76-100
-[36+54-(a:3+15)]:3=-24 (-1)
36+54-(a:3+15)=24x3
90-(a:3+15)=72
-(a:3+15)=72-90
-(a:3+15)=-18(-1)
a:3=18-15
a=3x3
a=9