text: # When I
  
  When I am as old as my older brother is today, my brother will be twice as old as I am today.
  a) How old is my brother if I am 8 years old today?
  b) How old am I if my brother is 21 today?
  
  Correct result:
  
  b =  12
  k =  14
  
  #### Solution:
  
  j=8
  j+x=b
  b+x = 2•j
  
  j = 8
  b-j-x = 0
  b-2j+x = 0
  
  b = 12
  j = 8
  x = 4
  
  Our linear equations calculator calculates it.
  
  c=21
  k+z=c
  c+z = 2•k
  
  c = 21
  c-k-z = 0
  c-2k+z = 0
  
  c = 21
  k = 14
  z = 7
  
  Our linear equations calculator calculates it.
  
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