Answer
$$2\frac{1}{2}. $$
Work Step by Step
We divide by the monomial as follows:
$$ (15x)\div (6x)=\frac{15x }{6x}=\frac{3\cdot 5x}{3\cdot 2x}=\frac{5}{2}=2\frac{1}{2}. $$
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