[tex]8x-12\leq 0\\\\8x\leq 12\ \ \ |:8\\\\x\leq 1,5\\\\x\in(-\infty;1,5][/tex]

[tex]3x+11 > 5\\\\3x > 5-11\\\\3x > -6\ \ \ |:3\\\\x > -2\\\\x\in(-2;+\infty)[/tex]

[tex]3x-13\geq 7x+3\\\\3x-7x\geq 3+13\\\\-4x\geq 16\ \ \ |:(-4)\\\\x\leq -4\\\\x\in(-\infty;-4][/tex]