Respuesta :

-6g/5 that would be the answer . This is how i got it. 
6f+9g=3g+f
5f+9g=3g
5f=-6g


6f+9g=3g+f

Step 1: Add -f to both sides.

6f+9g+−f=f+3g+−f

5f+9g=3g

Step 2: Add -9g to both sides.

5f+9g+9g=3g+9g

5f=6g

Step 3: Divide both sides by 5.

5f/5=6g/5

f=−6/5g