6x + 4(2x + 3) = 34 + 3x

6x + 4(2x) + (4)(3) = 34 + 3x

6x + 8x + 12 = 34 + 3x

14x + 12 = 34 + 3x

12 = 39 + -11x

-27/-11 = =11x/-11

2.45 = x

2 answers

I get x=2

Not sure how 34 changed to 39
6x + 4(2x + 3) = 34 + 3x

6x + 8x + 12 = 34 + 3x

14x - 3x = 34 - 12

11x = 22

x = 2

You can prove my answer is correct by substituting 2 for x in your original problem.