X1 −2x2 −x3 +3x4 = 0, −2x1 +4x2 +5x3 −5x4 = 3, 3x1 −6x2 −6x3 +8x4 = 2.(2pts) among the four variables {x1,x2,x3,x4}, which are the basic variables and which are the free
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