<PRE><B>Question 1196646</B>
.

In your system of equations, 1st equation and 2nd equation are correct,
while 3rd equation is incorrect.


The correct form for the 3rd equation is

    12*b + 0*r + 1*p = 7.9



Then the values listed in your post form the CORRECT answer/solution to the corrected system of equations.


At this point, I stop my explanations.



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It is also interesting to me, how did you manage to get the correct solution, 
working with incorrect system of equations ?



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