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4xa=36
Bxb=a
B+a=c
C+b=d
D+b=e


Răspuns :

4xa=36 => a=9
bxb=a => b=3
b+a=c => c=3+9=> c=12
c+b=d  => d=12+3=> d=15
d+b=e => e=15+3=> e=18