Question

7х2+ 2x+ 3a- 3,9=0 ​

Answer 1

ответ смотри на фото, надеюсь помогла

Answer 2

It seems you've provided an equation: $7x^2 + 2x + 3a - 3.9 = 0$. This equation contains two variables, $x$ and $a$. If you're looking for a solution for $x$ and $a$ that satisfy this equation, you would need more information or additional equations to uniquely determine the values of $x$ and $a$.

If you have specific values for $x$ and $a$ or more equations involving these variables, please provide that information so I can assist you further.