Решить систему способом Гаусса:
x1 - 2x2 +3x3 + 4x4 = 4
x2 - x3 + x4 = -3
x1 + 3x2 - 3x4 = 1
-7x2 + 3x3 + x4 = 13
x1 - 2x2 +3x3 + 4x4 = 4
x2 - x3 + x4 = -3
x1 + 3x2 - 3x4 = 1
-7x2 + 3x3 + x4 = 13
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