1090,9(8x + 6)- 1090,90,4 = l090,910.

I think there’s some ambiguity with the formatting. Could you confirm the exact equation? I’m guessing you mean decimal commas, not thousands separators. A plausible interpretation is:

1090.9(8x + 6) − 1090.904 = 1090.910

If that’s correct, here’s the solution:

1. 1090.9(8x + 6) = 1090.910 + 1090.904 = 2181.814
2. 8x + 6 = 2181.814 / 1090.9 ≈ 2.000012833
3. 8x ≈ -3.999987167
4. x ≈ -0.4999984 ≈ -0.5

So x is about -0.5 (to three decimals). If you meant a different arrangement (e.g., different placement of decimal points or using comma as a thousands separator), please share the exact equation and I’ll solve that version.