Evaluate 
 x = 1
 y = 2
 z = 3 
 x = 4
 y = 5
 z = 6 
 x = 6
 y = 4
 z = 5 
 3x + 2y
 7
 22
 26
 x + 5
 6
 9
 11
 15
 15
 15
 15