If vec x+ vec cxx vec y= vec a and vec...

If ` vec x+ vec cxx vec y= vec a` and `vec y+ vec cxx vec x= vec b` ,where `vec c` is a nonzero vector, then which of the following is not correct?
a. ` vec x=( vec bxx vec c+ vec a+( vec c . vec a) vec c)/(1+ vec c . vec c)`
b. ` vec x=( vec cxx vec b+ vec b+( vec c . vec a) vec c)/(1+ vec c . vec c)`
c. ` vec y=( vec axx vec c+ vec b+( vec c . vec b) vec c)/(1+ vec c . vec c)`
d. none of these

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