L = (A+C)/2 = (-1,1)
Not sure what column vectors have to do with this, since we're just dealing with points.
But C+(L-C) = L
the directed segment CL is just L-C
Maybe you can work this into some kind of column vector setup.
A triangle has vertices A(1,-3) B(7,5) and C(-3,5).L is the midpoint of side AC. Express CL as column vectors
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