Question 17296
4a+2u+i =2 ------------1
5a+3u+2i=17 -----------2
a-5u    =3 ------------3

Adding 1,2 and 3

10a + 3i = 22
10a = 22 -3i
a = 22/10 - 3i/10

according to equation 3  
a-5u    =3 
(22-3i)/10  - 5u = 3
22-3i - 50u = 30
50u = -8 -3i
  u = (-8 -3i)/50


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