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546+127-96:3+73*2-(62:a+24:2)-5*11=689

Răspuns :

673-32+146-(62:a+12)-55=689
62:a+12=732-689
62:a=43-12
a=62:31
a=2
546+127-32+146-(62:a+12)-55=689
546+127-32+146-62/a-12-55=689
720-62/a=689
31=62:a
a=2