s=468
s-d=300
468-d=300
d=468-300
d=168
a+b=468
a-b=168 => a=168+b
168+b+b=468
2b=468-168
2b=300
b=300:2
b=150
a=168+150
a=318
==============================
a+b+c+d+e=765
a=a
b=a+2
a+b=174
a+a+2=174
2a=174-2
2a=172
a=86
b=a+2=> b=86+2
b=88
c=c
d=c+2
e=c+2+2=c+4
174+c+c+2+c+4=765
3c+174+6=765
3c=765-6-174
3c=585
c=195
d=195+2
d=197
e=195+2+2
e=199