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Ответ:

Вроде так

{z - 3b = 5|•(-2)

{2z - 4b = 34

{-2z + 6b = -10

{2z - 4b = 34

-2z+6b+2z-4b = -10+34

2b = 24

b = 12

z = 5+3b = 5+36 = 41

Объяснение:

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