9*{720+[3*(9072:-a)-2400:6]-78}=36900
9*{720+[3*(9072:-a)-400]-78}=36900
9*{720+[-(3*9072):a-400-78]=36900
9*[-400-78+720-(3*9072):a]=36900
9*[-400-78+720-(27216:a)]=36900
9*[242-(27216:a)]=36900
242-27216:a=36900:9
242-27216:a=4100
[2(121a-13608):a=4100
2(121a-13608)=4100*a
242a-27216=4100*a
-3858*a=27216
impartim ambele parti la -3858
a=-(4536/643)
