Separate onto different lines. It'll be easier to read. For example, you probably would have noticed that:
```javascript
Cartesian3.negate(right.translation, scratchTCartesian);
Cartesian3.add(left.translation, scratchTCartesian, scratchTCartesian);
```
is the same as
```javascript
Cartesian3.subtract(left.translation, right.translation, scratchTCartesian);
```
:)