What is the result of the first step when simplifying 13-4 (x-5)

I don't really get this question but simply put, if you are in college syntax matters very much. (13-4) = 9 * (x-5) = 9x-45 ... although in this case. since there isn't a bracket around 13-4. you'd multiply by the - 4 first, giving you, 4x-20+30 = 4x-10