I don’t understand this somebody explain to me how to do it and the answer I really appreciated

Answer:
11
Step-by-step explanation:
3/2 y - 3 + 5/3 z
We know the values for y (y=6) and z( z=3), so we can substitute them into the expression
3/2 * (6) - 3 + 5/3 * (3)
Multiply the terms
18/2 - 3 + 15/3
Simplify the fractions
9 - 3 + 5
Simplfiy
6 + 5
11