r=2e and (r+6)=3(a+6) and a=e-8
r=2e, r+6=3a+18, a=e-8
r=2e, r=3a+12, a=e-8
since r=r we can say
2e=3a+12, using a=e-8 in this we get:
2e=3(e-8)+12
2e=3e-24+12
2e=3e-12
-e=-12
e=12, since a=e-8
a=4, since r=2e
r=24
so
Robin is 24 years old, Earl is 12 years old, and Adam is 4 years old.