Răspuns:
Ex 1.
a=bx5
b=c:3
c=2xd
d=99=>c=2x99=198 c=198. d=99
b=198:3=66 b=66
a=66x5=330 a=330
Ex.2
a=b:9
b=c:2
c=d-96
d=2xe
e=4x21
e=84=> e=84
=>d=2x84=168 d=168
c=168-96=72 c=72
b=72:2=36 b=36
a=36:9=4. a=4
Ex.3
a=b+15
b=c:3
c=d+51
d=e:2
90:e=5=>
=>e=90:5=18
d=18:2=9
c=9+51=60
b=60:3=20
a=20+15=35
