There are a lot of other step that will be in between but the answer will end up being.....
Answer: Log (a^2c/ b^3 d^4)
I know its a long problem but i have to shiw how i got my answer.
Here to solve the equation we need to plug in the value y as given. -5x+2(7x)=9. -5x+14x=9. 9x=9. X=1.
-3/2,-5,1/4,3.14,49 hope that helped!