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Obtain an equivalent system by performing the stated elementary operation on the system. Replace the second equation by the sum of itself and -2 times

Obtain an equivalent system by performing the stated elementary operation on the system. Replace the second equation by the sum of itself and -2 times the third equation

-7 x + 14y + 15z = 35

4x + 13 y - 7z = 16

3x - 14y -13z = -16

Please show work

Thank you

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