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
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