How to order a command to do x++ multiple times?

Question

int x = 6;
x++;
Console.WriteLine(x);

How to change it by keeping x++ to get 9 without writing 3 lines of x++

Answer 1

in 1 line: x += 3 (it is a shorthand for x = x +3)
OR by using a cycle:
for (; x < 9; x++)

Actually an increment (x++) used only for addind 1 to a variable.

Answer 2

for(x=6;x<=9;x++)