$3 x-4+8=30$

Step 1 ：Add 4 to both sides of the equation to get rid of the -4 on the left side, resulting in \(3x + 8 = 34\).

Step 2 ：Subtract 8 from both sides of the equation to get rid of the +8 on the left side, resulting in \(3x = 26\).

Step 3 ：Divide both sides of the equation by 3 to solve for x, resulting in \(x = \frac{26}{3}\).

Step 4 ：The solution to the equation \(3x - 4 + 8 = 30\) is \(x \approx \boxed{8.67}\).