Решите систему неравенств
а) 7x - 12>> 13x
    1-4x > 13

в) 5у < 2y +9
    8 - 2y > 10

д) 6y - 1 < 3y + 14
    8 - y > 3y

ж) 3z + 2 >> 7 + 4z
     4z - 1 < 2z + 7
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