уравнение 2x=4 -10z=2 3x= -1                                

                      7         5        3

1)2х=4                      2)-10z=2            3)3х=-1

х=2                                z=-2                   х=-1

Ответ:2                        Ответ:-2                   3

                                                               ответ: -1

                                                                           3

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