The equation would look like this: -3(x + 6) = 4. Then solve to find x.
-3x -18 = 4 → -3x = 22 → x = -7.3
You can substitute this number into the equation to check.
-3(-7.3 + 6) = 4 → 3.9 = 4. As you can see the number isn't exact becuase -7.3 is a repeating decimal.