Question 1179316
Solve the given equation by Gauss elimination method
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Not "an equation"  it's a system of equations.
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Using x, y & z would be better, IMO.
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x₁ + 2x2-3x3 = -1

-3x1 + x2-9x3 = -7

5x+3x2 - 4x3 = 2