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12 у+у и 8 в*125 х, если в=58,х=8

-6 + z = 0                       (-3.8):x = 38                     2(x+3) = 12

Z = 6.                              x = -3.8:38                      2x + 6 = 12

                                       x = -0.1                           2x = 6

                                                                              x = 3

z/5 + 3 = -7                     8x - 12 = 3x + 8                0.8у+1.2=0.4у-2.8 

z/5 = -10                          5x = 20                            0.4y = -4 

z = -50                              x = 4                                y = -10

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