frances age is 6 years less than 2 times her sisters age. frances age is 15 minus her sisters age. how old is frances?

Question

i don’t understand how to do it, they both have minus so how would that even make any type of sense

Answer 1

F=2S-6

F=15-S

subtract to get 3S-21 = 0, S = 7 years old for the sister

Fran's age = 15-7 = 8 years old

8= 2(7)=6 = 14-6

8 = 15-7