x1 = 1/2*x3+15-3/2*x4, x2 = -x3+20+2*x4
或x1 = 25-1/2*x2-1/2*x4, x3 = 20-x2+2*x4
或x1 = -1/4*x3+30-3/4*x2, x4 = -10+1/2*x2+1/2*x3
或x2 = -2 x1 + 50 - x4, x3 = 2 x1 - 30 + 3 x4
或x2 = -4/3*x1-1/3*x3+40, x4 = -2/3*x1+10+1/3*x3
或x3 = -4*x1+120-3*x2, x4 = -2*x1+50-x2
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