The mixed number 4 (2/3) can be put into improper form, which would be (14/3). Next, you need to divide it by (2/3). An easier method is to multiply by the reciprocal instead, which is (3/2).
(14/3) * (3/2) --> (14 * 3) / (3 * 2) --> (42/6).
If asked, this will simplify to 7.