Explicație pas cu pas:
b=7a/3
5a-b=5a-7a/3=(15a-7a)/3=8a/3
3b=7a 2a+3b=2a+7a=9a
8a 8a 1 8a
--- --- × ---= ---= 8/27
3 3 9a 27a
-- =
9a
--
1
