a=4b
b=c+25
d=c+75
d=3e
d+e=400 => In loc de d scriem 3e si va iesi: 3e+e=400; 4e=400; e=400:4=100.
d+e=400; d+100=400; d=400-100=300.
d=300
e=100
d=c+75; 300=c+75; c=300-75=225 => c=225
b=c+25; b=225+25=250 => b=250
a=4b; a=4x250; => a=1000
Rezultate:
a=1000
b=250
c=225
d=300
e=100