[tex]1.) \: x - 11 = 9 \\ x = 9 + 11 \\ x = 20[/tex]
[tex]2.) \: x + 12 = 4 \\ x = 4 - 12 \\ x = - 8[/tex]
[tex]3.) \: 6b - 12 < 6 \\ 6b < 6 + 12 \\ 6b < 18 \\ \frac{6b}{6} < \frac{18}{6} \\ b < 3[/tex]
[tex]4.) \: 1 - 2x < 5 \\ - 2x < 5 - 1 \\ - 2x < 4 \\ \frac{ - 2x}{ - 2} < \frac{4}{ - 2} \\ x < - 2[/tex]
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