Finite Math Examples

$- 3 x \cdot 1 + 5 x \cdot 2 = - 9$ , $- 4 x \cdot 1 + 4 x \cdot 3 = 20$ , $2 x \cdot 1 + x \cdot 2 + 2 x \cdot 3 = - 1$

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$- 3 x \cdot 1 + 5 x \cdot 2 = - 9, - 4 x \cdot 1 + 4 x \cdot 3 = 20, 2 x \cdot 1 + x \cdot 2 + 2 x \cdot 3 = - 1$