Answer
$-2\leq x\leq\frac{14}{3}$
Work Step by Step
$|x|\leq c$ means $-x\leq c\leq x$, hence here:
$|3x-4|\leq10\\-10\leq3x-4\leq10\\-6\leq3x\leq14\\-2\leq x\leq\frac{14}{3}$
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