What is 6x 3 +7x 2 +2x−8 equal

Don't know how to find x given these segment lengths

The u-drive rent-a-truck company plans to spend $13 million on 320 new vehicles. each commercial van will cost $25 comma 000, each small truck $50 comma 000, and each large truck  $80 comma 000. past experience shows that they need twice as many vans as small trucks. how many of each type of vehicle can they buy?

Pranza plotted point a in the coordinate plane below.