本题目来源于试卷: Modulus & Inequalities，类别为 IB数学
[问答题]
Let $f(x)=\frac{9-12 x}{c x-20}$ , for x$ \neq \frac{20}{c}$ , where c$\neq 0$ .
1. The line x=5 is a vertical asymptote to the graph of y=f(x) .
1. Find the value of c .
2. Write down the equation of the horizontal asymptote to the graph of y=f(x) .
2. The line y=h , where h $\in \mathbb{R}$ , intersects the graph of y=|f(x)| at exactly one point. Find the possible values of h .
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