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OpenStudy (anonymous):
Solve the system x -y -4z | -3 6x -7y -6z | -4 -3x 66z | 51
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OpenStudy (amoodarya):
divide 3rd equation by -3 to make it easier x -y -4z | -3 6x -7y -6z | -4 x +0y-22z | 17 now find x from the 3rd equation then put into others to eliminate x then you will have 2 variable to solve then find y from of them and put into other to eliminate y and find z so now 1 step back find y with respect z then do like that for x
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