How do you solve these?

The additive inverse of -2/3 is just 2/3, because those two would add to 0. The multiplicative inverse is -3/2, because it would multiply with -2/3 to give 1. The third one is the distributive property. The second one--I'm not sure--x with a vertical line after it meaning where, n is a natural number, x=-3n. But I'm not sure.