Respuesta :

-3(f-5)=-9
-3f+15=-9
-15 -15
-3f=-24
Divided by -3
F=8

First we want to divide -3 from both sides work:

-3(f-5) / -3 = -9 / -3

f-5 = 3

Then we need to add 5 to both sides, work:

f-5+5=3+5

f=8

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