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Solve for all 4-tuples (x1, x2, x3, x4) simultaneously satisfying the following equations: 8x1 −9x2 −2x3...

Solve for all 4-tuples (x1, x2, x3, x4) simultaneously satisfying the following equations:

8x1 −9x2 −2x3 −5x4 = 100

9x1 +6x2 −6x3 +9x4 = 60

−3x1 −9x2 +4x3 −2x4 = −52

−7x2 +8x3 +8x4 = −135

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