Solve
\(\begin{align*} a + 2b &= 1, \\ b + 2c &= 3, \\ c + 2a &= 7. \end{align*}\)
From 1st eq b = (1-a)/2
From 3rd eq c = 7-2a sub these into second equation
(1-a)/2 + 14-4a = 3
1-a + 28-8a = 6
29 -9a = 6
a = 23/9
b= -14/18 = -7/9
c= 17/9
+36916 
