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12 - [ 168 - (24 + b * 12)] - 12 = 0

* = inmultit


Răspuns :


168-(24+12b)=0 ; 12 se simplifica cu -12

24+12b=168;

12b=168-24=144;

b=144/12;

b=12

12-[168-(24+12b)]=12
-168-(24+12b=12-12
-(24+12b)=0-168
-(24+12b)=-168
12b=168-24
b=144:12
b=12

proba
12-(168-168)-12=12-0-12=0