11. 6-(2,3x-1)-3,5x+0,7x = 0,5 (x-14).

Let's solve the equation step by step: 1. Simplify the equation: $$6 - (2.3x - 1) - 3.5x + 0.7x = 0.5(x - 14)$$ 2. Distribute the negative sign and 0.5: $$6 - 2.3x + 1 - 3.5x + 0.7x = 0.5x - 7$$ 3. Combine like terms on the left side: $$7 - 5.1x = 0.5x - 7$$ 4. Add $$5.1x$$ to both sides: $$7 = 5.6x - 7$$ 5. Add 7 to both sides: $$14 = 5.6x$$ 6. Divide both sides by 5.6: $$x = \frac{14}{5.6} = \frac{140}{56} = \frac{70}{28} = \frac{35}{14} = \frac{5}{2} = 2.5$$ Now, let's see which of the given options is correct. None of the provided options match $$x=2.5$$. But since the correct answer should be one of the given options, there could be a typo in the problem statement or in the options. Let's re-evaluate the problem. $$6 - (2.3x - 1) - 3.5x + 0.7x = 0.5(x - 14)$$ $$6 - 2.3x + 1 - 3.5x + 0.7x = 0.5x - 7$$ $$7 - 5.1x = 0.5x - 7$$ $$14 = 5.6x$$ $$x = \frac{14}{5.6} = 2.5$$ The provided options are: A) $$\frac{-2}{21}$$ B) $$10.5$$ C) $$\frac{2}{21}$$ D) $$7$$ There seems to be a typo in the question or the options. Let's assume the question is correct. If we want to find an answer from the given choices closest to our derived answer: Since 2.5 is closest to none of them, there must be a mistake in copying the question. Thus none of the above choices are correct. However, assuming the correct answer must be one of the options provided, let's examine the initial equation for a mistake in copying: Answer: None of the above