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Теңсіздікті шешіңіз
[tex]1) \: 7 \leqslant 2x + 3 \leqslant 11[/tex]
[tex]2) \: - 3 < 1 + 2x \leqslant 7[/tex]
[tex]3) \: - 2 < \frac{8 + x}{7} < 4[/tex]
[tex]4) \: - 7 \leqslant \frac{2x + 1}{2} < 2[/tex]
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