РЕШИТЕ ЛИНЕЙНЫЕ УРАВНЕНИЯ СПОСОБОМ СЛОЖЕНИЯ a) 2x + y=12
и
    7x - 2 y=31
б) y - 2x=4
и
    7x - y=1
в) 8y - x=4
и
    2x - 21 y=2
г) 2x= y + 0,5
и
   3x - 4 y=12
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