Ответы на вопрос:
x-7< 2 x< 9 -3x< 9 x> -3 (при делении на (-3)< 0 знак неравенства поменяли) )\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\( ответ: х є (-3,9) .
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