Answer
$$-7\frac{1}{2}.$$
Work Step by Step
By multiplying both sides by $15$, we get
$$5x-30=9x \Longrightarrow 4x=-30.$$
By dividing both sides by $4$, we have
$$x=-\frac{30}{4}=-\frac{15}{2}=-7\frac{1}{2}.$$
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