Sam has x model planes. Anton has 8 more planes than Sam does. How many model planes Does Anton have

Sam has x model planes. Anton has 8 more planes than Sam does. How many model planes Does Anton have? how many planes do they have together?

Sam has x
Anton has x + 8 since the word more means we add

The word together means we add, so we have:
Sam + Anton = x + x + 8

Grouping like terms, we have:
Sam + Anton = 2x + 8