Question 874969
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Hi
 f3 + f4 = 100 - 31 = 69
  f3 +   f4 = 69
67f3 + 70f4 = 4704    {{{6.745*100 -( 5*61 + 18*64 + 8*73)}}}
 f3 = 42, f4 = 27
*[invoke cramers_rule_2x2 67,70,4704,1,1,69]