I tried to solve it using the matrix formula:
D = A^(-1)*B, but I do not get the right answer.
Pls help
Important note: bond D is exactly twice bond C, so if you try to invert the matrix of CF’s, you will not be able to!!! 
If you eliminate either C or D, you’ll have more variables than equations, so you won’t get a unique solution.
you are right, what can I do, then?
I believe that you misspelled something in your title.
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