The answer you selected is incorrect. To solve this problem first take the original equation,

First, we need to combine like terms by adding, to both sides of the equation. This makes the equation, .

We could divide both sides of the equation by *-5* to get the value of *x,* but we are not interested in finding the value of *x,* but we are interested in the value of *15x*. So, we can multiply both sides of the equation by *-3* to find the value of *15x*

After multiplying both sides of the equation by *-3* makes the equation . So, the answer to this problem is *15,* which is *D*.

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