If veca and vecb are non zero, non colli...

If `veca and vecb` are non zero, non collinear vectors and `veca_(1)=lambda veca+3 vecb, vecb_(1)=2veca+lambda vecb, vec c_(1)=veca+vecb`. Find the sum of all possible real values of `lambda` so that points `A_(1), B_(1), C_(1)` whose position vectors are `veca_(1), vecb_(1), vec c_(1)` respectively are collinear is equal to.

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