$[3, 6]$ Refer to the attached image below for the graph.
Work Step by Step
Add 4 to each part to have: $\\5+4 \le 3x-4+4\le 14+4 \\9 \le 3x \le 18$ Divide 3 to each part to have:; $\\3 \le x \le 6$ Thus, the solution is $[3, 6]$.
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