4:(6*4/3)+х

Simplify step by step:

• Compute the inside: 6 * 4 / 3 = 24 / 3 = 8
• Then: 4 ÷ 8 = 1/2

So the expression is x + 1/2 (i.e., (2x + 1)/2). If you know x, you can substitute it in. If you meant a different grouping, let me know.