Finite Math Examples

$2 x \cdot 1 + x \cdot 2 - x \cdot 4 = 4$ , $x \cdot 2 + x \cdot 4 + x \cdot 5 = 4$ , $x \cdot 1 - x \cdot 3 + 2 x \cdot 4 = 0$

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$2 x \cdot 1 + x \cdot 2 - x \cdot 4 = 4, x \cdot 2 + x \cdot 4 + x \cdot 5 = 4, x \cdot 1 - x \cdot 3 + 2 x \cdot 4 = 0$