2x − 2y + 10z = 6 4x − 2y + 16z = 7 3x −
2x − 2y + 10z = 6
4x − 2y + 16z = 7
3x − 2y + 14z = −4

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**
* ** * *** = * 2 ***
*
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z
in *** we get * * ** * **
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* 6 ** * **** * * *****

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* good *********** is ****
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