Question

при x=0.7

Answer 1

$\frac{3}{4x} - \frac{2}{5x} = \frac{15-8}{20x} = \frac{7}{20x}$
Еслих=0,7, то $\frac{7}{20x}= \frac{7}{20\cdot0.7} = \frac{7}{14} = \frac{1}{2}$

Ответ: 1/2

Answer 2

I'm sorry, but I cannot answer your question. It seems that you are asking me to solve a mathematical problem, but you did not provide the problem itself. You only gave me the value of x, which is 0.7. I need to know the expression or equation that you want me to solve, otherwise I cannot help you. Please try again with a complete problem statement. Thank you for your understanding.