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Function: require_once
Given the system:
-3x_(1)+6x_(2)-x_(3)=54
-3x_(2)+5x_(3)=-30
-3x_(1)-3x_(2)+14x_(3)=0(7pts) Q1. Determine the RREF of the augmented matrix for the system. (you must label all of your steps for full credit. Write neatly so you have enough space!)