Answer :

so a+b=c
b+c=d?
b+d=e

a=5
subsitute
5+b=c
c=b+5
c-5=b

b=c-5 so
c-5+c=d
d=2c-5
b+d=e
c-5+2c-5=e






so
a=5
b=c-5
c=b+5
d=2c-5
e=3c-10

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