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1 * x1 + 0 * x2 + 0 * x3 - 1 * x4 = 0
0 * x1 + 2 * x2 - 1 * x3 + 0 * x4 = 0
-1 * x1 + 1 * x2 + 0 * x3 + 0 * x4 = -30
-1 * x1 + 1 * x2 + 1 * x3 - 1 * x4 = 0
Lösung:
x1 = 90
x2 = 60
x3 = 120
x4 = 90